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  • iPhone OS: Strategies for high density image work

    - by Jasconius
    I have a project that is coming around the bend this summer that is going to involve, potentially, an extremely high volume of image data for display. We are talking hundreds of 640x480-ish images in a given application session (scaled to a smaller resolution when displayed), and handfuls of very large (1280x1024 or higher) images at a time. I've already done some preliminary work and I've found that the typical 640x480ish image is just a shade under 1MB in memory when placed into a UIImageView and displayed... but the very large images can be a whopping 5+ MB's in some cases. This project is actually be targeted at the iPad, which, in my Instruments tests seems to cap out at about 80-100MB's of addressable physical memory. Details aside, I need to start thinking of how to move huge volumes of image data between virtual and physical memory while preserving the fluidity and responsiveness of the application, which will be high visibility. I'm probably on the higher ends of intermediate at Objective-C... so I am looking for some solid articles and advice on the following: 1) Responsible management of UIImage and UIImageView in the name of conserving physical RAM 2) Merits of using CGImage over UIImage, particularly for the huge images, and if there will be any performance gain 3) Anything dealing with memory paging particularly as it pertains to images I will epilogue by saying that the numbers I have above maybe off by about 10 or 15%. Images may or may not end up being bundled into the actual app itself as opposed to being loaded in from an external server.

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  • Resize image while rotating image in android

    - by dhams
    Hi every one ,,m working with android project in which i want to rotate image along with touch to some fix pivot point ,,,i have completed all the things but i have facing one problem ,,,while m trying to rotate image the image bitmap is resize....i dont have any idea why it occur ....if somebody have den please give me idea to come over this problem.... my code is below ..... package com.demo.rotation; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.os.Bundle; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.ImageView; import android.widget.ImageView.ScaleType; public class temp extends Activity{ ImageView img1; float startX; float startX2 ; Bitmap source; Bitmap bitmap1 = null; double r; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); img1 = (ImageView) findViewById(R.id.img1); img1.setOnTouchListener(img1TouchListener); bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.orsl_circle_transparent); } private OnTouchListener img1TouchListener = new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_MOVE: Log.d("MOVE", "1"); if(source!=null) r = Math.atan2(event.getX() - source.getWidth(), (source.getHeight() / 2) - event.getY()); Log.i("startX" + event.getX(), "startY" + event.getY()); rotate(r,bitmap1, img1); img1.setScaleType(ScaleType.CENTER); break; case MotionEvent.ACTION_DOWN: break; case MotionEvent.ACTION_UP: break; default : break; } return true; } }; private void rotate(double r , Bitmap currentBitmap ,ImageView imageView ) { int rotation = (int) Math.toDegrees(r); Matrix matrix = new Matrix(); matrix.setRotate(rotation, currentBitmap.getWidth()/2, currentBitmap.getHeight()/2); source = Bitmap.createBitmap(currentBitmap, 0, 0, currentBitmap.getWidth(), currentBitmap.getHeight(), matrix, false); imageView.setImageBitmap(source); Log.i("HIGHT OF CURRENT BITMAP", ""+source.getHeight()); } }

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  • Image processing on bifurcation diagram to get small eps size

    - by yCalleecharan
    Hello, I'm producing bifurcation diagrams (which are normally used in nonlinear dynamics). These diagrams identify abrupt changes in topologies due to stability changes. These abrupt changes occur as one or more parameters pass through some critical value(s). An example is here: http://en.wikipedia.org/wiki/File:LogisticMap_BifurcationDiagram.png On the above figure, some image processing has been done so as to make the plot more visually pleasant. A bifurcation diagram usually contains hundreds of thousands of points and the resulting eps file can become very big. Journal submission in the LaTeX format require that figures are to be submitted in the eps format. In my case one of such figures can result in about 6 MB in Matlab and even much more in Gnuplot. For the example in the above figure, 100,000 x values are calculated for each r and one can imagine that the resulting eps file would be huge. The site however explains some image processing that makes the plot more visually pleasing. Can anyone explain to me stepwise how go about? I can't understand the explanation provided in the "summary" section. Will the resulting image processing also reduce the figure size? Furthermore, any tips on reducing the file size of such a huge eps figure? Thanks a lot...

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  • SVG <image> doesn't work in <defs> on Chrome

    - by avladev
    I want to use image in a group definded in defs tag. But on Chrome nothing works. In Firefox only the .png file is displayd. Only Rectangle apears but with strange bug in Chrome. Is this is supported by SVG or im not using it right. plane.svg <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg baseProfile="full" width="500" height="500" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1"> <defs> <g id="car"> <rect x="0" y="0" width="30" height="30" fill="#ff0000" /> <image xlink:href="items/car.svg" x="0" y="0" width="30" height="30" /> <image xlink:href="items/t6k.png" x="100" y="100" width="140" height="140" /> </g> </defs> <use xlink:href="#car" x="0" y="0" width="600" height="600" /> </svg> images/car.svg <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg baseProfile="full" width="30" height="30" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1"> <rect x="0" y="0" width="30" height="30" fill="red" stroke="green" stroke-width="3"/> </svg> Download code: http://www.4shared.com/file/9gNi5gCO/svg_bug.html

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  • Changing RGB color image to Grayscale image using Objective C

    - by user567167
    I was developing a application that changes color image to gray image. However, some how the picture comes out wrong. I dont know what is wrong with the code. maybe the parameter that i put in is wrong please help. UIImage *c = [UIImage imageNamed:@"downRed.png"]; CGImageRef cRef = CGImageRetain(c.CGImage); NSData* pixelData = (NSData*) CGDataProviderCopyData(CGImageGetDataProvider(cRef)); size_t w = CGImageGetWidth(cRef); size_t h = CGImageGetHeight(cRef); unsigned char* pixelBytes = (unsigned char *)[pixelData bytes]; unsigned char* greyPixelData = (unsigned char*) malloc(w*h); for (int y = 0; y < h; y++) { for(int x = 0; x < w; x++){ int iter = 4*(w*y+x); int red = pixe lBytes[iter]; int green = pixelBytes[iter+1]; int blue = pixelBytes[iter+2]; greyPixelData[w*y+x] = (unsigned char)(red*0.3 + green*0.59+ blue*0.11); int value = greyPixelData[w*y+x]; } } CFDataRef imgData = CFDataCreate(NULL, greyPixelData, w*h); CGDataProviderRef imgDataProvider = CGDataProviderCreateWithCFData(imgData); size_t width = CGImageGetWidth(cRef); size_t height = CGImageGetHeight(cRef); size_t bitsPerComponent = 8; size_t bitsPerPixel = 8; size_t bytesPerRow = CGImageGetWidth(cRef); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); CGBitmapInfo info = kCGImageAlphaNone; CGFloat *decode = NULL; BOOL shouldInteroplate = NO; CGColorRenderingIntent intent = kCGRenderingIntentDefault; CGDataProviderRelease(imgDataProvider); CGImageRef throughCGImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpace, info, imgDataProvider, decode, shouldInteroplate, intent); UIImage* newImage = [UIImage imageWithCGImage:throughCGImage]; CGImageRelease(throughCGImage); newImageView.image = newImage;

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  • Fetch image from folder via datatable does not work after placing image in subdirectory

    - by Arnold Bishkoff
    I am having trouble wrapping my head around the following I have code that fetches an image via smarty in a line img src="getsnap.php?picid={$data[$smarty.section.sec.index].picno|default:$nextpic}&typ=pic&width={$config.disp_snap_width}&height={$config.disp_snap_height}" class="smallpic" alt="" / this works if i pull the image from /temp/userimages/userid/imageNo.ext but because an OS can segfault if you store too many folders or images in a directory i have code that assigns the user image to a subdirectory based upon division of a subdir per 1000 userids. so in thise case i have user id 94 whos images get stored in /siteroot/temp/userimages/000000/94/pic_1.jpg (through 10) or tn_1 (through 10).jpg here is the code for getsnap.php <?php ob_start(); if ( !defined( 'SMARTY_DIR' ) ) { include_once( 'init.php' ); } include('core/snaps_functions.php'); if (isset($_REQUEST['username']) && $_REQUEST['username'] != '') { $userid = $osDB-getOne('select id from ! where username = ?',array(USER_TABLE, $_REQUEST['username']) ); } else { // include ( 'sessioninc.php' ); if( !isset($_GET['id']) || (isset($_GET['id'])&& (int)$_GET['id'] <= 0 ) ) { $userid = $_SESSION['UserId']; } else { $userid = $_GET['id']; } } if (!isset($_GET['picid']) ) { if ((isset($_REQUEST['type']) && $_REQUEST['type'] != 'gallery') || !isset($_REQUEST['type']) ) { $defpic = $osDB-getOne('select picno from ! where userid = ? and ( album_id is null or album_id = ?) and default_pic = ? and active = ? ',array(USER_SNAP_TABLE, $userid,'0','Y','Y' ) ); if ($defpic != '') { $picid = $defpic; } else { $picid = $osDB-getOne('select picno from ! where userid = ? and ( album_id is null or album_id = ?) and active=? order by rand()',array(USER_SNAP_TABLE, $userid,'0','Y' ) ); } unset( $defpic); } } else { $picid = $_GET['picid']; } $typ = isset( $_GET['typ'])?$_GET['typ']:'pic' ; $cond = ''; if ( ($config['snaps_require_approval'] == 'Y' || $config['snaps_require_approval'] == '1') && $userid != $_SESSION['UserId'] ) { $cond = " and active = 'Y' "; } $sql = 'select * from ! where userid = ? and picno = ? '.$cond; //Get the pic $row =& $osDB-getRow ( $sql, array( USER_SNAP_TABLE, $userid, $picid ) ); //Okay pic was found in the DB, Lets actually do something // $id = $userid; $dir = str_pad(($id - ($id % 1000))/100000,6,'0',STR_PAD_LEFT); $zimg = USER_IMAGES_DIR.$dir; $img = getPicture($zimg, $userid, $picid, $typ, $row); //$img = getPicture($userid, $picid, $typ, $row); //$img = getPicture($dir, $userid, $picid, $typ, $row); $ext = ($typ = 'tn')?$row['tnext']:$row['picext']; // Now pic is built as // something pic_x.ext ie pic_2.jpg if ( $img != '' && ( ( hasRight('seepictureprofile') && ( $config['snaps_require_approval'] == 'Y' && $row['active'] == 'Y' ) ||$config['snaps_require_approval'] == 'N' ) || $userid == $_SESSION['UserId'] ) ) { $img2 = $img; //$img2 = $dir.'/'.$img; } else { $gender = $osDB-getOne( 'select gender from ! where id = ?', array( USER_TABLE, $userid ) ) ; if ($gender == 'M') { $nopic = SKIN_IMAGES_DIR.'male.jpg'; } elseif ($gender == 'F') { $nopic = SKIN_IMAGES_DIR.'female.jpg'; } elseif ($gender == 'D') { $nopic = SKIN_IMAGES_DIR.'director.jpg'; } $img2 = imagecreatefromjpeg($nopic); $ext = 'jpg'; } ob_end_clean(); header("Pragma: public"); header("Content-Type: image/".$ext); header("Content-Transfer-Encoding: binary"); header("Cache-Control: must-revalidate"); $ExpStr = "Expires: " . gmdate("D, d M Y H:i:s", time() - 30) . " GMT"; header($ExpStr); $id = $userid; $dir = str_pad(($id - ($id % 1000))/100000,6,'0',STR_PAD_LEFT); $zimg = USER_IMAGES_DIR.$dir; //header("Content-Disposition: attachment; filename=profile_".$userid."_".$typ.".".$ext); //header("Content-Disposition: attachment; filename=$dir.'/'.profile_".$userid."".$typ.".".$ext); //header("Content-Disposition: attachment; filename=profile"$dir".'/'.".$userid."_".$typ.".".$ext); header("Content-Disposition: attachment; filename=profile_".$userid."_".$typ.".".$ext); /* if ($_SESSION['browser'] != 'MSIE') { header("Content-Disposition: inline" ); } */ if ($ext == 'jpg') { imagejpeg($img2); } elseif ($ext == 'gif') { imagegif($img2); } elseif ($ext == 'png') { imagepng($img2); } elseif ($ext == 'bmp') { imagewbmp($img2); } imagedestroy($img2); ?

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  • Wrapper background image gets cut off at the top

    - by dq7133
    My site has a wrapper with three background images. A static top and bottom image and a third image that repeats along the y axis. For some reason the top background image is getting cut off and I can't figure out way. Here is a link to the live site: http://storrepictures.weebly.com/projects.html I have offset the top and bottom images so you can see what they look like. You can see that the top one is cut off. I've tried messing around with some of the div padding settings but can't seem to get it to work. One interesting note: The background images used to be JPEGs (I switched to PNG files because I needed transparency). When I was using JPEGs this was not a problem - the three images lined up perfectly. Let me know if it would help to have the actual code posted. From what I've been reading on this forum, people seem to like looking at the live site and I didn't want to make the post too long. Thanks a lot for all your help.

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  • How do I show and position an Image initialized in the codebehind on my page?

    - by Andreas Strandfelt
    Hello. I have created a simple method to check if an image has been approved and finally returns it as an control. But how do i call and show it on the page? I've tried something like this in the aspx-file: <% SendImage("DKBygMiniLogo.gif", "True"); %> Here is the simple method: protected Image SendImage(object Image, object Approved) { bool approved = Convert.ToBoolean(Approved); Image img = new Image(); if (approved) { img.ImageUrl = "~/images/Ads/" + Image.ToString(); img.Visible = true; } else { img.ImageUrl = "~/images/Ads/" + Image.ToString(); img.Visible = false; } return img; } How do I actually show the image?

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  • jQuery - Toggle CSS Background Image Expand/Close

    - by urbanrunic
    I am looking for a way to change the back ground image on toggle as in this questions here: jQuery - Toggle Image Expand/Close My issue is I have this html: <button id="close-menu"></button> <div id="menu-bar"> <div class="wrapper"> <a href="http://www.website.com" target="_blank"> <img src="image.png" alt=""> </a> <div class="options"> <h2>eBlast Tools</h2> <ul> <li class="toggle-images">Images are <span>enabled</span>. Click to disable.</li> <li class="download-zip"><a href="download.zip">Download ZIP File</a></li> </ul> </div> </div> </div> and this is my current jquery: $('#close-menu').click(function() { $('#menu-bar').slideToggle(400); return false; }); and this is the css: #close-menu { background: url(../img/minus-button.png); background-position: top left; width: 25px; height: 25px; position: absolute; top: 10px; right: 20px; z-index: 100; border: none; } #close-menu:hover { background: url(../img/minus-button.png); background-position: bottom left; }

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  • How can I overlay a watermark on an already resampled image in PHP (using GD) ?

    - by Rick
    Here's my current code: define('IMG_WIDTH', (isset ($_GET['width'])) ? (int) $_GET['width'] : 99); define('IMG_HEIGHT', (isset ($_GET['height'])) ? (int) $_GET['height'] : 75); $image = imagecreatefromjpeg($_GET['image']); $origWidth = imagesx($image); $origHeight = imagesy($image); $croppedThumb = imagecreatetruecolor(IMG_WIDTH, IMG_HEIGHT); if ($origWidth > $origHeight) { $leftOffset = ($origWidth - $origHeight) / 2; imagecopyresampled($croppedThumb, $image, 0, 0, $leftOffset, 0, IMG_WIDTH, IMG_HEIGHT, $origHeight, $origHeight); } else { $topOffset = ($origHeight - $origWidth) / 2; imagecopyresampled($croppedThumb, $image, 0, 0, 0, $topOffset, IMG_WIDTH, IMG_HEIGHT, $origWidth, $origWidth); } It basically takes an image and re-sizes it to create a thumbnail. It works quite nicely. What I would like to do now is add a watermark to the bottom right corner. I've seen the imagecopymerge function used for this... However, that doesn't seem to allow me to supply a resampled image as the source. How can I take my already modified image and add a watermark? :/ I've thought of saving the image to /tmp and then unlink()'ing it once I've added the watermark but that seems like a bit of a mess...

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  • Image Gurus: Optimize my Python PNG transparency function

    - by ozone
    I need to replace all the white(ish) pixels in a PNG image with alpha transparency. I'm using Python in AppEngine and so do not have access to libraries like PIL, imagemagick etc. AppEngine does have an image library, but is pitched mainly at image resizing. I found the excellent little pyPNG module and managed to knock up a little function that does what I need: make_transparent.py pseudo-code for the main loop would be something like: for each pixel: if pixel looks "quite white": set pixel values to transparent otherwise: keep existing pixel values and (assuming 8bit values) "quite white" would be: where each r,g,b value is greater than "240" AND each r,g,b value is within "20" of each other This is the first time I've worked with raw pixel data in this way, and although works, it also performs extremely poorly. It seems like there must be a more efficient way of processing the data without iterating over each pixel in this manner? (Matrices?) I was hoping someone with more experience in dealing with these things might be able to point out some of my more obvious mistakes/improvements in my algorithm. Thanks!

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  • How To Create A Link For "save Image As" To Download an Image In Rails

    - by Kuya
    I want to make a link download like this http://idwallpaper.com/download.php?image_id=1517 I have tried on other tutorial like this <script> function SaveFile(fname){ img.document.execCommand('saveas', null ,fname) } </script> <iframe id="img" src="myimage.jpg" width="(image width + 20)px" height="(image height + 25)px" scrolling="no" frameborder="0px"></iframe> <button onclick="SaveFile('myimage.jpg');">save as</button> Does not work in FireFox though.....

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  • add/delete image ID to/from textbox when image clicked

    - by Huseyin
    I am working on a simple news module. There is a form where user adds multiple image IDs to one textbox then submits it. To improve the usability, I listed all the images they can add (ID numbers displayed next to it) on one side. However, this still is little bit confusing. I want image IDs added/deleted to the textbox when user clicks on the images. Spare me codes, methods, ideas, examples... I will take anything.

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  • Android How do you save an image with your own unique Image Name?

    - by Usmaan
    This sounds like a issue a beginner like me would only have...this is my code... private void saveAvatar(Bitmap avatar) { String strAvatarFilename = Id + ".jpg"; try { avatar.compress(CompressFormat.JPEG, 100, openFileOutput(strAvatarFilename, MODE_PRIVATE)); } catch (Exception e) { Log.e(DEBUG_TAG, "Avatar compression and save failed.", e); } Uri imageUriToSaveCameraImageTo = Uri.fromFile(new File(PhotoActivity.this.getFilesDir(), strAvatarFilename)); Editor editor = Preferences.edit(); editor.putString(PREFERENCES_AVATAR, imageUriToSaveCameraImageTo.getPath()); editor.commit(); ImageButton avatarButton = (ImageButton) findViewById(R.id.ImageButton_Avatar); String strAvatarUri = Preferences.getString(PREFERENCES_AVATAR, ""); Uri imageUri = Uri.parse(strAvatarUri); avatarButton.setImageURI(null); avatarButton.setImageURI(imageUri); } This does save the image but when i go to look at the image on the sd card ti is called imag001 etc not the ID i am labelling it. How do i save the image with a name i want to call it? regards

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  • display text when image on-click/hide text when different image click

    - by Jonah1289
    Hi I have created the following effects on the images seen here http://techavid.com/design/test3.html . You see when you hover and then click on each image, they go from grey to color. When you click on one - the others go grey and the one clicked remains color. That's cool, but now I need the text 1st: Sun for example to display and hide along with its graphic button. The word "Sun," is a link that needs to link out to a URL so it has to be separated from the image effect code. What jquery or javascript code do I need to do this? thanks, jonah p.s. How do i properly post the code I have now. I tried to paste code in "enter code here," but received errors - thnx

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  • Create a simple automatic image switcher using jQuery

    - by Kim Andersen
    Hi all. I need to create a very simple image switcher that changes my images automatically. I have the following code: <div class="imgCarousel"> <div class="imgC1 left"><img src="/media/1614/1_1.jpg" alt="img1" /></div> <div class="imgC2 left"><img src="/media/1615/2_1.jpg" alt="img2" /></div> <div class="imgC3 left"><img src="/media/1616/3_1.gif" alt="img3" /></div> <div class="imgC4 left"><img src="/media/1617/4_1.jpg" alt="img4" /></div> <div class="imgC5 left"><img src="/media/1618/5_1.jpg" alt="img5a" /></div> <div class="imgC6 left"><img src="/media/1620/6_1.jpg" alt="img6a" /></div> <div class="imgC7 left"><img src="/media/1622/7.jpg" alt="img7" /></div> </div> Two of the above images should be switched automatically after a certain amount of time (every 3-4 sec.). This means that after 4 seconds, I'd like to change the image called /media/1618/5_1.jpg with another image. And after another 4 seconds, I'd switch back again. The same shold be made for one of my other images. How can I acomplish this with some jQuery?

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  • Post valuse and upload Image to php server in android

    - by lawat
    I am trying to upload image from android phone to php server with additional values,the method is post my php file look like this if($_POST['val1']){ if($_POST['val2']){ if($_FILE['image']){ ...... } } }else{ echo "Value not found"; } I am doing is URL url=new URL("http://www/......../myfile.php"); HttpURLConnection con=(HttpURLConnection) url.openConnection(); con.setDoInput(true); con.setDoOutput(true); con.setUseCaches(false); con.setRequestMethod("POST");//Enable http POST con.setRequestProperty("Connection", "Keep-Alive"); con.setRequestProperty("Content-Type", "multipart/form-data;boundary="+"****"); connection.setRequestProperty("uploaded_file", imagefilePath); DataOutputStream ostream = new DataOutputStream( con.getOutputStream()); String res=("Content-Disposition: form-data; name=\"val1\""+val1+"****"+ "Content-Disposition: form-data; name=\"val2\""+val2+"****" "Content-Disposition: form-data; name=\"image\";filename=\"" + imagefilePath +"\""+"****"); outputStream.writeBytes(res); my actual problem is values are not posting so first if condition get false and else section is executed that is it give value not found please help me

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  • Image is not displaying in email template on 2nd time forward

    - by Don
    Good day Friends, I've a mass mailing program with simple mail templates (HTML and few Images). I've a problem with image display. My clients are not getting images in the mail. Sometimes they get a mail with all the images, But if they forward the same email to someone else, they can’t get the images in forwarded mail. I really don’t know what’s happening with the approach., most of the cases the 2nd time forwarded mail is not showing the images properly. For example, consider I send a mail to client A, Here, Client A will get a mail with Images. Further, If Client A forward the same message to Person B then Person B is not getting Images in the Forwarded email. I’m using the following Approach to Embed an image in the mail template: StringBuilder sb = new StringBuilder(" <some html content> <img src=\"cid:main.png\" alt=\"\" border=\"0\" usemap=\"#Map\"> </html content ends here>"); Attachment imgMain = new Attachment(Server.MapPath("main.png")); imgMain.ContentId = "main.png"; MailMessageObject.Attachments.Add(imgMain); Instead of attachment, I tried bypassing the Image path from server directly. Something like as follows: StringBuilder sb = new StringBuilder(" <some html content> <img src=\"www.mydomain.com/images/main.png\" alt=\"\" border=\"0\" usemap=\"#Map\"> </html content ends here>"); But, result is same, Please help to resolve this problem

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  • Panning Image Using Javascript in ASP.Net Page Overflows Div

    - by Bob Mc
    I have an ASP.Net page that contains a <div> with an <img> tag within. The image is large so the <div> is set with a size of 500x500 pixels with overflow set to scroll. I'm attempting to add image panning using a click and drag on the image. However, every time I begin dragging the image escapes the boundary of the element and consumes the entire page. Here is example code that illustrates the problem: <%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <div id="divInnerDiv" style="overflow:scroll; width:500px; height:500px; cursor:move;"> <img id="imgTheImage" src="Page0001.jpg" border="0" /> </div> <script type="text/javascript"> document.onmousemove = mouseMove; document.onmouseup = mouseUp; var dragObject = null; var mouseOffset = null; function mouseCoords(ev){ if(ev.pageX || ev.pageY){ return {x:ev.pageX, y:ev.pageY}; } return { x:ev.clientX + document.body.scrollLeft - document.body.clientLeft, y:ev.clientY + document.body.scrollTop - document.body.clientTop }; } function getMouseOffset(target, ev){ ev = ev || window.event; var docPos = getPosition(target); var mousePos = mouseCoords(ev); return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y}; } function getPosition(e){ var left = 0; var top = 0; while (e.offsetParent){ left += e.offsetLeft; top += e.offsetTop; e = e.offsetParent; } left += e.offsetLeft; top += e.offsetTop; return {x:left, y:top}; } function mouseMove(ev) { ev = ev || window.event; var mousePos = mouseCoords(ev); if(dragObject){ dragObject.style.position = 'absolute'; dragObject.style.top = mousePos.y - mouseOffset.y; dragObject.style.left = mousePos.x - mouseOffset.x; return false; } } function mouseUp(){ dragObject = null; } function makeDraggable(item){ if(!item) return; item.onmousedown = function(ev){ dragObject = this; mouseOffset = getMouseOffset(this, ev); return false; } } makeDraggable(document.getElementById("imgTheImage")); </script> </div> </form> </body> </html> Also note that this HTML works fine in a non-ASP.Net page. Is there something in the ASP.Net Javascript that is causing this issue? Does anyone have a suggestion for panning a JPEG within a <div> block that will work in ASP.Net? I have tried using the jQueryUI library but the result is the same.

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  • How do I prevent ImageMagick convert from scaling images *up*?

    - by Kyle
    I'm using ImageMagick's convert tool to generate image thumbnails for a web application. I'm using notation like so: 600x600> The images are indeed scaled to 600px wide/tall (depending on the longer side) and proportions are properly maintained, however images less than 600px in either direction are scaled up — this behavior is not desired. Is there a way to prevent convert from scaling images up if the destination dimensions both exceed the original image size?

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  • 3 divs as background

    - by woody993
    I've been working on this for a couple of hours and can't seem to wrap my head around it. I have three images, below, and I would like the text content to sit on top of these, but how do I do it? The middle image is the image that would need to repeat as the container div expands. Top: Middle repeating: Bottom:

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  • Word to GIMP pasted image too small

    - by Marcelo Cantos
    I paste an image from Microsoft Word 2010 into GIMP 2.6.10 using Edit ? Paste as ? New Image, but the pasted image is less than half-size (1280×800 down to 553×347). Pasting into an existing blank 1280×800 image makes no difference. On the other hand, pasting exactly the same clipboard entry into Windows Paint works beautifully, producing a razor-sharp 1280×800 image, and furthermore, pressing Ctrl+C in Paint, then going to Gimp and pressing Shift+Ctrl+V in Gimp produces the correct full-size image in Gimp too. Why does pasting an image directly from Word to Gimp reduce the image size? How can I make it paste the correct image size without having to go via Paint? UPDATE: I just noticed that cutting the image from Word and pasting back into the same document also loses definition. Paint must be magical.

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  • Using Image Source with big images in WPF

    - by xyzzer
    I am working on an application that allows users to manipulate multiple images by using ItemsControl. I started running some tests and found that the app has problems displaying some big images - ie. it did not work with the high resolution (21600x10800), 20MB images from http://earthobservatory.nasa.gov/Features/BlueMarble/BlueMarble_monthlies.php, though it displays the 6200x6200, 60MB Hubble telescope image from http://zebu.uoregon.edu/hudf/hudf.jpg just fine. The original solution just specified an Image control with a Source property pointing at a file on a disk (through a binding). With the Blue Marble file - the image would just not show up. Now this could be just a bug hidden somewhere deep in the funky MVVM + XAML implementation - the visual tree displayed by Snoop goes like: Window/Border/AdornerDecorator/ContentPresenter/Grid/Canvas/UserControl/Border/ContentPresenter/Grid/Grid/Grid/Grid/Border/Grid/ContentPresenter/UserControl/UserControl/Border/ContentPresenter/Grid/Grid/Grid/Grid/Viewbox/ContainerVisual/UserControl/Border/ContentPresenter/Grid/Grid/ItemsControl/Border/ItemsPresenter/Canvas/ContentPresenter/Grid/Grid/ContentPresenter/Image... Now debug this! WPF can be crazy like that... Anyway, it turned out that if I create a simple WPF application - the images load just fine. I tried finding out the root cause, but I don't want to spend weeks on it. I figured the right thing to do might be to use a converter to scale the images down - this is what I have done: ImagePath = @"F:\Astronomical\world.200402.3x21600x10800.jpg"; TargetWidth = 2800; TargetHeight = 1866; and <Image> <Image.Source> <MultiBinding Converter="{StaticResource imageResizingConverter}"> <MultiBinding.Bindings> <Binding Path="ImagePath"/> <Binding RelativeSource="{RelativeSource Self}" /> <Binding Path="TargetWidth"/> <Binding Path="TargetHeight"/> </MultiBinding.Bindings> </MultiBinding> </Image.Source> </Image> and public class ImageResizingConverter : MarkupExtension, IMultiValueConverter { public Image TargetImage { get; set; } public string SourcePath { get; set; } public int DecodeWidth { get; set; } public int DecodeHeight { get; set; } public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { this.SourcePath = values[0].ToString(); this.TargetImage = (Image)values[1]; this.DecodeWidth = (int)values[2]; this.DecodeHeight = (int)values[3]; return DecodeImage(); } private BitmapImage DecodeImage() { BitmapImage bi = new BitmapImage(); bi.BeginInit(); bi.DecodePixelWidth = (int)DecodeWidth; bi.DecodePixelHeight = (int)DecodeHeight; bi.UriSource = new Uri(SourcePath); bi.EndInit(); return bi; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new Exception("The method or operation is not implemented."); } public override object ProvideValue(IServiceProvider serviceProvider) { return this; } } Now this works fine, except for one "little" problem. When you just specify a file path in Image.Source - the application actually uses less memory and works faster than if you use BitmapImage.DecodePixelWidth. Plus with Image.Source if you have multiple Image controls that point to the same image - they only use as much memory as if only one image was loaded. With the BitmapImage.DecodePixelWidth solution - each additional Image control uses more memory and each of them uses more than when just specifying Image.Source. Perhaps WPF somehow caches these images in compressed form while if you specify the decoded dimensions - it feels like you get an uncompressed image in memory, plus it takes 6 times the time (perhaps without it the scaling is done on the GPU?), plus it feels like the original high resolution image also gets loaded and takes up space. If I just scale the image down, save it to a temporary file and then use Image.Source to point at the file - it will probably work, but it will be pretty slow and it will require handling cleanup of the temporary file. If I could detect an image that does not get loaded properly - maybe I could only scale it down if I need to, but Image.ImageFailed never gets triggered. Maybe it has something to do with the video memory and this app just using more of it with the deep visual tree, opacity masks etc. Actual question: How can I load big images as quickly as Image.Source option does it, without using more memory for additional copies and additional memory for the scaled down image if I only need them at a certain resolution lower than original? Also, I don't want to keep them in memory if no Image control is using them anymore.

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