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• Will OpenGL give me any FPS improvement over CoreAnimation for scrolling a large image?

  - by Ben Roberts

  Hi, I'm considering re-writing the menu system of my iPhone app to use Open GL just to improve the smoothness of scrolling a big image (480x1900px) across the screen. I'm looking at doing this as a way to improve on using the method/solution as described here (http://stackoverflow.com/questions/1443140/smoother-uiview). This solution was a big improvement over the previous implementation but it's still not perfect and as this is the first thing the user will see I'd like it to be as flawless as possible. Will switching to OpenGL give me the sort of smooth scrolling I'm looking for? I've stayed clear of OpenGL until now as this is my first app and core animation has handled everything else I've thrown at it well enough, would be good to know if this alternative implementation is likely to work! thanks

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• In Adobe Air, how do I pull an image from a sqlite database that was created with .net?

  - by smartdirt

  We have the need to create a sqlite database that contains images. The database is created using .net. After the db is created we need to use an air application to pull the images from the sqlite db created with c#. The database is created fine and Air can read all but the BLOB field which contains a bytearray created from an image in .net. My assumption is that the .net bytearray is not compatible with the actionscript bytearray because the actionscript byte array is encoded using the AMF protocol and the .net bytearray is not.

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• How to rotate particular image in multiple images drawn to canvas in android ?

  - by Andhravaala

  Hi All, I need a small help on rotating one image around its center of axis among multiple images those are drawn to canvas in android. I am loading images to canvas like below. canvas.drawBitmap(mMachineBackground, 0, 0, null); canvas.drawBitmap(mMachineRotator, 0, 0, null); I want to rotate only the second bitmap instead of entire canvas. And, I want to move another particular bitmap half circular like earth rotating around sun(in this case only for half circular). Please help me in this. And, please guide me to any good Android canvas and animation sample. Thanks in advance.

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• Should I Return "500" or "404" if a Requested Image is not Found?

  - by Michael Robinson

  I work with code written by other people, occasionally I am left somewhat confused and at these times Stack Overflow saves me. Please, save me again. Our site allows people to upload images and later embed them within text in our site like so: <img src="http://site.com/image_script.php?p=some_image_identifier"/> My question is: If the identifier, "p", does not lead us to an image should the server return "500" or "404"? I would have thought it should be "404", but that's not what is happening right now.

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• How do I blur (ios7 style) a section of an image in a UITableViewCell?

  - by George McKibbin

  I've got a UIImageView that takes up the whole cell and shows an image. I'd like to blur the bottom third of the view in the iOS7 style (we're targeting iOS7). There will be a label over the blurred part. The issue seems to be that I can't "screenshot" the UIImageView right as I am setting up the cell in tableView:cellForRowAtIndexPath: as it hasn't loaded yet. Although i've even tried setting up a timer for a 0.1 second delay and that also doesn't work. I've tried the stuff on http://damir.me/posts/ios7-blurring-techniques I've tried https://github.com/justinmfischer/7blur I'd like to use the new screenshotting API drawViewHierarchyInRect:afterScreenUpdates: I'd also like to use apple's sample code UIImage+ImageEffects The only thing that has worked so far has been to just put a UIToolbar in but the performance is really slow. I don't need dynamic updates. I've managed to get the following effect a few times but it has just tinted the view and hasn't actually blurred anything so I'm a bit confused.

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• How to get image height and width using java?

  - by Dick Song

  Is there any other way beside using imageIO.read to get image height and width? Because I encounter some issue that will lockup the thread. at com.sun.medialib.codec.jpeg.Decoder.njpeg_decode(Native Method) at com.sun.medialib.codec.jpeg.Decoder.decode(Decoder.java:87) at com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageReader.decode(CLibJPEGImageReader.java:73) - locked <0xd96fb668> (a com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageReader) at com.sun.media.imageioimpl.plugins.clib.CLibImageReader.getImage(CLibImageReader.java:320) - locked <0xd96fb668> (a com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageReader) at com.sun.media.imageioimpl.plugins.clib.CLibImageReader.read(CLibImageReader.java:384) - locked <0xd96fb668> (a com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageReader) at javax.imageio.ImageIO.read(ImageIO.java:1400) at javax.imageio.ImageIO.read(ImageIO.java:1322) This error only occurs on sun app server I suspect that it is a sun bug

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• PHP/Apache: Permission settings for uploaded JPEG image files not correct.

  - by Mike

  I just setup a LAMP development server and am still trouble-shooting some things. The server is installed on one computer and I use a Windows laptop to write my code and test the site via the web browser. My file uploading script works in that JPEG image files are successfully uploaded to the server, but when I try to view the images in the web browser, permission is denied. I check the permissions on the file via the server and they are 600. I can fix the issue by chmod 777 theimage.jpg, but this doesn't seem like a good solution at all. Does the solution have something to do with Apache configuration? Or is there something else I should be doing. Thank-you, Mike

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• How do I layout an image that will be dynamically sized in interface builder?

  - by Tony

  I am having trouble laying out scrollable view in interface builder. A screen shot of my layout is here. As you can see the layout is pretty simple. The UIImageView above the text will not have a specific height. It may be 100px high or 300px high. This is why the view is scrollable. I am experiencing two problems with this layout: 1) For some reason the image will sit behind the text instead of pushing it down. Take a look here. 2) The obvious other problem is that the upper most UIImage and UILabel are getting pushed up off of the screen. I am thinking this has to do with the UIScrollView but I haven't been able to figure out why. Thanks!

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• Online Image Slideshow Question. File Access Problems.

  - by msandbot

  Hi, I have a flash .swf file that I embed on my webpage. On my server I have the .swf file and multiple image folders. I would like to load every file in one of those folders into the flash slideshow. How should I go about doing this? I tried used Air but it doesn't work on my system as an application so I doubt it will work online. Eventually I plan on making a menu where you can select different folders to display and since they are of different sizes, a foreach loop would be optimal. Keeping a txt file with the number of images is also possible if theres a way to read that in, but I would prefer the more dynamic approach. I am working towards using php for the website if that helps find a solution. Thanks, -Mike Also my slideshow works great online currently but i have to hardcode in the number of files.

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• Get real image width and height with Javascript in Safari/Chrome?

  - by Frank Bannister

  I am creating a jQuery plugin. How do I get real image width and height with Javascript in Safari? Following works with Firefox 3, IE7 and Opera 9: var pic = $("img") // need to remove these in of case img-element has set width and height pic.removeAttr("width"); pic.removeAttr("height"); var pic_real_width = pic.width(); var pic_real_height = pic.height(); But in Webkit browsers like Safari and Google Chrome values are 0... Doing this on server side is not an option.

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• How can I detect whether an image is a PNG or APNG format?

  - by perlit

  APNG is backwards compatible with PNG. I opened up an apng and png file in a hex editor and the first few bytes look identical. So if a user uploads either of these formats, how do I detect what the format really is? I've seen this done on some sites that block apng. I'm guessing the ImageMagick library makes this easy, but what if I were to do the detect without the use of an image processing library (for learning purposes)? Can I look for specific bytes that tell me if the file is apng? Solutions in any language is welcome.

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• custom list field with more than one row(image and text), and can be populated using a vector

  - by Jisson

  In my app I want show a list,and when user click in any list item ,some new items must be added to the same list.Now I use default ListField of bb and a vetcor to add or remove elements to or from it.Now I want the list to hold more than one row(an image and some text), i searched for it I got some good sample but it not suitable for me(http://stackoverflow.com/questions/1872160/how-to-customize-list-field-in-blackberry). I need a custom listfield which have atleast two rows and can be populated using a vector from the MainScreen class.I want only one object of custom class.If any one have idea please help.

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• How to stop Javascript from showing default image and only text for link?

  - by tokyowp

  The Javascript below has a default image, but I would like display text "only text url" for this link instead of this button at this link http://developer.mixi.co.jp/wp-content/uploads/2010/09/bt_check_1.gif that this script defaults to. Is this possible? <div> <a href="http://mixi.jp/share.pl" class="mixi-check-button" data-key="some-data-key" data-url="http://someurl.com">only text url </a> <script type="text/javascript" src="http://static.mixi.jp/js/share.js"></script> </div>

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• django-lfs upload Image doesn't work on some environment ?

  - by vernomcrp

  yesterday, after I complete setup django-lfs without buildout. Happlily create categories and products but while I upload image to product after I push upload button its stay always 'pendings'. I use fedora django==1.1.2,PIL==1.1.7. but its work on osx. Now I try on Ubuntu9.10 with completely PIL==1.1.7 and Django==1.1.2 and its won't work. Anyone hav some good solution for this ? (i may think of flash version because upload part looklike its come from flash)

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• How to force a line break after each image in Safari Reader?

  - by futlib

  I was unable to activate Safari Reader in a local HTML file, so I cannot give you a running example but only describe my problem: The markup of my blog posts is basically this: <div class="post"> <div class="post-header">Hello, World</div> <div class="post-body"> <p>Look at this picture:</p> <p><img src="http://37prime.com/news/wp-content/uploads/2008/03/safari_icon.png"/></p> <p>Isn't that a nice picture?</p> </div> </div> This looks as expected in all browsers, including Safari. In Safari Reader however, the third paragraph "Isn't that a nice picture?" is floating around the image, instead of being on a paragraph of it's own. Has anybody experienced a similar problem?

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• Is it possible to center an image on both axis inside a div?

  - by Noor

  I have a script that loads in a div with images running jQuery Cycle Lite Plugin. I got the tip that I could us the "after" function in that plugin to make changes to the picture each time the image is refreshed. So I wrote this: $("#display div").css({ margin: "0 auto", "text-align": "center", }); The html built like this: <div id="display"> <div id="slideshow1"> <img ... /> </div> </div> This isn't working, whats wrong? ( this is supposed to center it horizontally, i need to center it vertically to )..

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• How can I fill in the blanks to display just my image?

  - by Ignacio

  <h:inputText id="email" value="#{user.user.email}" title="Email" onchange="this.form.submit()" required="true" requiredMessage="_____"> <f:validator validatorId="checkvalidemail"/> </h:inputText> <h:message for="email" styleClass="error"/> validation: String enteredEmail = (String)object; Pattern p = Pattern.compile(".+@.+\\.[a-z]+"); Matcher m = p.matcher(enteredEmail); boolean matchFound = m.matches(); if (!matchFound) { FacesMessage message = new FacesMessage(); message.setSummary("____"); throw new ValidatorException(message); and css .error { background-image: url('includes/style/delete2.png'); text-align: left; font-size: 36px; } Thank you very much Best Regards Ignacio

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• Style all anchors except those that contain images, without adding class or id to the image tag?

  - by Deca

  With the example below, I need to add padding and background-color properties to the text anchor. I then need to exclude padding and background-color from anchors that contain images. <p> <a href="#">this is a text link that needs to be styled</a> <a href="#"><img src="image/name.jpg" alt="this needs to be excluded from styling" /></a> </p> If I have a red background and padding on my text links, I do not want that same red background and padding to appear on my linked images. The images will always be in their own anchors, not mixed with text within the same anchor. The rub is that I can not add classes or IDs to the img tags - I do not have edit control of that data. So how can I add CSS attributes to all anchors, while excluding anchors that contain images?

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• Best way to validate a WinCE OS image (.bin) file?

  - by Ryan Clark

  We have a Windows CE 6.0 based product that allows for firmware upgrades through a web interface. I want to perform a sanity check on the new firmware image to be sure that it is valid. How should I perform the validation? I see in the BIOSLOADER code, there is support code for decoding a BIN file. I suppose I could massage that to perform the validation. Is there a better way? Thanks!

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• Reading and decoding PDF-417 barcodes stored in an image or PDF file from within a .NET application

  - by John Rasch

  I am looking for a .NET library that is able to decode data from a PDF-417 barcode that is embedded either in an image file or PDF. At this point, I have only been able to find a Java version and a C version. Ideally, this library would be both open-source and free of charge, but I doubt such a decoder exists. I am open to trying out demos of existing products that you may have had experience with - which leads me to the question - have you had any experience reading PDF-417 barcodes embedded in images or PDFs using .NET, and which of the available products would you recommend to do so?

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• How to vertically align an inline image with inline text following it?

  - by amn

  Is there any way to vertically align an image element generated by a "content" property as part of a ":before" selector, next to adjacent inline text? In other words, I have <a href="..." class="facebook">Share on Facebook</a> As I don't want to pollute my markup with unnecessary IMG elements that only have to do with style, I resort to adding a small icon to the left of the link, via CSS (except that it does not align properly, hence the question): a.facebook:before { content: url(/style/facebook-logo.png); } I tried adding a "vertical-align: middle" (one of the most notoriously difficult aligning concepts to grasp in CSS, in my opinion, is that very property) but it has no effect. The logo aligns with text baseline, and I don't want to hardcode pixel offsets, because frankly text size differs from browser to browser, etc. Is there any solution for this? Thanks.

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• How to create HTML email with embeded image and show it in the default mail client using .net (c#)?

  - by NVM

  If you look at the Snip tool in windows there is an option to send the snip as an embedded attachment in the default mail client (I guess as an html email). I need exactly that. At the moment I am using simple MAPI to attach the image but that does not allow embedding. One key requirement is that it should be created and then shown in the default mail client. I don't think I can use System.Net.Mail for that. Or can I? Its a WPF application using c#.

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• How to invert arrow image placed before the first cell when tableview cells are swiped beyond first

  - by neha

  Hi all, In my application, I need to add this functionality that there should be an arrow image upside down placed before first cell and some text like "Pull down to refresh" and when user pulls the table beyond this then this arrow gets inverted and text changes to "Release to refresh" and when the user releases his finger, the data is refreshed and rows get added to that point So now this initial arrow and text moves upwards before the first cell again. Can anybody tell me wheather there's any event that does this? Or else which event I need to capture in order to add this functionality? Thanks in advance.

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• iPhone SDK: How do I programatically change the background image of a UIButton added to a NIB?

  - by user304583

  I've seen several questions/answers related to entirely creating a button in code, but not one which would let me know how to change the button image in code, when I originally added the button to my NIB in Interface Builder. I know how to change the background in Interface Builder.. but I want to change it in code, so I can change it automagically. Any help really appreciated! Perhaps the answer is so obvious nobody needs to ask.. if so please forgive the dweeb that I am and help! :-)

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• What's the best graphics library for node.js for image cropping?

  - by Travis

  I'm creating a website using node.js. I have seen many libraries mentioned that piggy back on top of imagemagick etc. There is a list here: https://github.com/ry/node/wiki/modules#graphics What I'm trying to do is take the image that a user uploads, crop it/size it to certain dimensions the site requires. What is the best/most active script to do this? I'd like one with npm support. Does anyone have actual experience using some of these?

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