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  • PHP find if file data is an image

    - by Christian Sciberras
    Imagine I have some file data in a variable $data. I need to determine whether it is an image or not. No need for details such as corrupt images etc. Firs thought would be getting the file mime type by looking at the magic number and then see whether "image" is in the mime type. No such luck, even if I have a "file extension to mime type" script, I don't have a reliable way to get mime from magic number. My next option was to have a reasonable list of image file magic numbers and consult them. However, it relatively difficult to find such magic numbers (gif for instance has different magic numbers, some of which could pretty rare - if memory serves me right). A better idea would be some linux program which can do this kind of thing. Any ideas? I'm running RHEL and PHP 5.3. I've got root access - ie able to install stuff if needed. - Chris.

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  • Help with getting data from resized image.

    - by nick
    I'm using an ASP.NET file upload control and then resizing an image and storing the new image in a new Bitmap. Here is the code I have so far: protected void ResizeImage() { Bitmap originalBMP = new Bitmap(FileUpload1.FileContent); //Calculate new image dimensions int origWidth = originalBMP.Width; int origHeight = originalBMP.Height; int sngRatio = origWidth / origHeight; int newWidth = 100; int newHeight = newWidth / sngRatio; Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight); } I'm uploading directly to Amazon S3 and I need to pass some data to its upload method. How do I get the following information from my new bitmap that I have been using with the fileupload?: FileUpload1.FileBytes FileUpload1.FileBytes.Length Do I need to save my new bitmap to a stream so I can get an array of bytes?

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  • Setting background image in asp.net (Master page)

    - by JRC
    I'm new in asp.net. And I am having trouble setting my background image. Here's the master page source: <%@ Master Language="C#" AutoEventWireup="true" CodeFile="Master.master.cs" Inherits="Master"%> <!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"> <link rel="stylesheet" type="text/css" href="scripts/style.css"/> <title>Tracker</title> <asp:ContentPlaceHolder id="head" runat="server"> </asp:ContentPlaceHolder> </head> <body> <form id="form1" runat="server"> <div> <div class="container"> <a href="#"><img src="images/cross-header.gif" alt="Insert Logo Here" width="100%" id="Insert_logo" style="background: #C6D580; display:block;" /></a> <div class="sidebar1"> <nav> <ul> <li><a href="#">Home</a></li> <li><a href="#">LINK</a></li> <li><a href="#">LINK</a></li> <li><a href="#"><span style="font-weight:italic">LINK</span></a></li> <li><a href="#"><span style="font-weight:italic">LINK</span></a></li> </ul> </nav> <p>SOME LABEL</p> <p>SOME QUOTE HERE</p> <p></p> </div> </div> <footer> <a href="#">LINK HERE</a> | <a href="#">LINK HERE</a> | <a href="contact.php">CONTACT</a> | <a href="register.php">REGISTER</a> | <a href="login.php">LOGIN</a> <address> Copyright 2012 @JRC </address> </footer> </div> </form> </body> </html> The image that I am trying to use is located at the folder image. I don't know whats wrong. And here's what the style.css source: body { font: 100%/1.4 Verdana, Arial, Helvetica, sans-serif; margin: 0; padding: 0; background-image:url('images/background.jpg'); background-repeat:no-repeat; background-attachment:scroll; background-position:repeat-x; } I also tried this url('image/background.jpeg') etc. but still fails.

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  • Bulk convert PNG-24 to PNG-8 files with best quality

    - by Gavin
    Hi, Can anybody recommend a good method of bulk converting a large amount of PNG-24 files to PNG-8 with as little loss of quality as possible and maintaining transparency? I've tried ImageMagick but the resulting images weren't quite as crisp quality as I'd like. Using Paint.NET I was able to achieve far better results, but I can't bulk process with this tool as far as I know. The settings I used with ImageMagick in case there's better options to use: convert file.png -depth 4 file-output.png I've also been playing with OptiPNG, but I haven't discovered a was of making sure the output images are PNG-8. Cheers, Gavin

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  • How to convert a raw disk image to a copy-on-write image based on another image for use with kvm and

    - by Jean-Paul Calderone
    I have a virtual Windows machine running on kvm. Presently it has a 90GB raw disk image. I would like to clone this VM without having to keep two copies of the 90GB raw disk image around. It seems like a good approach for doing this is to make two new qcow or qcow2 images based on the original. First I converted the raw image to a qcow2 image: qemu-img convert -O qcow2 basewindowsxp.img basewindowsxp.qcow2 Then I tried creating a new image backed by this: qemu-img create -F qcow2 -f qcow2 -b `pwd`/basewindowsxp.qcow2 windowsxp-1.qcow2 Then I used virt-manager to point the original VM at windowsxp-1.qcow2. However, when I try to start up the VM in this new configuration, virt-manager reports an error: Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 588, in run_domain vm.startup() File "/usr/share/virt-manager/virtManager/domain.py", line 150, in startup self._backend.create() File "/usr/lib/python2.6/dist-packages/libvirt.py", line 300, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/windowsxp-1.qcow2 The error suggests that the filename was misspecified or that the filesystem permissions are too restrictive, but neither of these is the case: $ ls -l /var/lib/libvirt/images/windowsxp-1.qcow2 -rwxrwxrwx 1 root root 262144 2010-05-27 08:32 /var/lib/libvirt/images/windowsxp-1.qcow2 Why won't virt-manager start this vm?

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  • How to read a barcode from an image

    - by tardate
    I'm seeking a library, technique or advice on how to read an EAN-13 barcode from an image (including ISBN,and ISSN encodings). The image would come from a mobile phone or webcam, so resolution may be quite poor and not well aligned. I'm specifically interested in something that could be used from ruby on rails, but answers for other languages are welcome. Open Source solutions preferred. Leading solutions so far: ZBar (previously known as Zebra - h/t @bgbg, @Natim) and ZXing (h/t @codr)

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  • Finding edge and corner values of an image in matlab

    - by James
    Hi, this problem links to two other questions i've asked on here. I am tracing the outline of an image and plotting this to a dxf file. I would like to use the bwboundaries function to find the coordinates of the edges of the image, find the corner coordinates using the cornermetric function and then remove any edge coordinates that are not a corner. The important thing I need to be able to do is keep the order of the corner elements obtained from bwboundaries, so that the section traces properly. The dxf function I have that draws from the coordinates draws lines between coordinates that are next to each other, so the line has to be drawn "around" the section rather than straight between the corner points. The reason I am doing this is because there are less coordinates obtained this way, so it is easier to amend the dxf file (as there are less points to manipulate). The code I have so far is: %# Shape to be traced bw = zeros(200); bw(20:40,20:180) = 1; bw(20:180,90:110) = 1; bw(140:180,20:185) = 1; %# Boundary Finding Section [Boundary] = bwboundaries(bw); %Traces the boundary of each section figure, imshow(bw); hold on; colors=['b' 'g' 'r' 'c' 'm' 'y']; for k=1:length(Boundary) perim = Boundary{k}; %Obtains perimeter coordinates (as a 2D matrix) from the cell array cidx = mod(k,length(colors))+1;% Obtains colours for the plot plot(perim(:,2), perim(:,1),... colors(cidx),'LineWidth',2); end Coordmat = cell2mat(Boundary) %Converts the traced regions to a matrix X = Coordmat(:,1) Y = Coordmat(:,2) % This gives the edge coordinates in matrix form %% Corner Finding Section (from Jonas' answer to a previous question %# get corners cornerProbability = cornermetric(bw); cornerIdx = find(cornerProbability==max(cornerProbability(:))); %# Label the image. bwlabel puts 1 for the first feature, 2 for the second, etc. %# Since concave corners are placed just outside the feature, grow the features %# a little before labeling bw2 = imdilate(bw,ones(3)); labeledImage = bwlabel(bw2); %# read the feature number associated with the corner cornerLabels = labeledImage(cornerIdx); %# find all corners that are associated with feature 1 corners_1 = cornerIdx(cornerLabels==1) [Xcorners, Ycorners] = ind2sub(200,corners_1) % Convert subscripts The code I have is, to give a matrix Xfin for the final x coordinates (which are on the edge AND at a corner. Xfin = zeros(length(X),1) for i = Xcorners XFin(i) = Xcorners if i~= Xcorners XFin(i) = [] end end However, this does not work correctly, because the values in the solution are sorted into order, and only one of each value remains. As I said, I would like the corner elements to be in the same order as obtained from bwboundaries, to allow the image to trace properly. Thanks

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  • How to create an image from a UIView / UIScrollView

    - by Andre
    Hi, I have an image in an UIScrollView, that can be scrolled and zoomed. When the user presses a button, I want the code to create an image from whatever part of the UIScrollView is inside an area I specify with a CGRect. I've seen code to crop UIImages, but I can't adapt it to do the same for a view, because it uses CGContextDrawImage. Any thoughts? Cheers, Andre

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  • Crop the image using Jquery in C# and ASP.Net

    - by Vara Prasad.M
    I am having a image in one page and i have to crop the image to the predefined borders to crop this should happen using jquery and it has to be done in C# and ASP.Net and this is done by using Client side not the server side. but the X and Y coordinate values must be saved in hidden fields and used for backend plz reply me ASAP it is very urgent ThanQ, Vara Prasad.M

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  • Image upload and jCrop and codeigniter

    - by sea_1987
    Hi There, I am trying to build a system that allows a user to select an image from their own computer, and crop it using the jCrop tool from jQuery. My question is can I show the image the user has selected from their system without uploading it to a system, I dont really want to do two uploads, unless I can do the first upload silently? Any help would be great. Thank you.

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  • very large image manipulation and tiling

    - by Mohammad
    I need to a software , Program(Java),or a method for tiling very larg images (more than 140MB). I have used imagemagic and convert tools photoshop and corel draw and matlab (in win os) but I have problem with memory amount.and memory is not enough.imagemagic is very slow and result is not desirable. I dont know how can i only load a small part of image on hard disk to RAM .(with out load whole image from hard)

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  • how to crop an image using rectangale overlay and touch on iphone

    - by Amir
    Hey Everyone, I am looking for a good tutorial or sample code, that would show how to crop an image taking from iphone camera something in lines of http://www.defusion.org.uk/code/javascript-image-cropper-ui-using-prototype-scriptaculous/ but you would control the corners with your fingers any tip would be greatly appericated, as i am new to iphone dev. Thanks, Amir

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  • How to make android app's background image repeat.

    - by virsir
    I have set a background image in my app, but the background image is small and I want it to be repeated and filled in the whole screen. What should I do <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/bg" android:tileMode="repeat">

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  • Gravatar : Is there a default image?

    - by Ritesh M Nayak
    I have implemented gravatar for a portal I am building and wanted to know if there is a default image URL for gravatar? Not all people who visit the site are logged in or have email addresses, in such a case, is there a default image that can be shown (accessible via gravatar url)

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  • Jquery Automatic Image Slider w/ CSS & jQuery

    - by Jacinto
    This is Automatic Image Slider w/ CSS & jQuery by Soh Tanaka I am trying to customize it to show .desc when the mouse hover overs the slider but it does not seem to work any help? //Set Default State of each portfolio piece $(".paging").show(); $(".paging a:first").addClass("active"); //Get size of images, how many there are, then determin the size of the image reel. var imageWidth = $(".window").width(); var imageSum = $(".image_reel ul.examples").size(); var imageReelWidth = imageWidth * imageSum; //Adjust the image reel to its new size $(".image_reel").css({'width' : imageReelWidth}); //Paging + Slider Function rotate = function(){ var triggerID = $active.attr("rel") - 1; //Get number of times to slide var image_reelPosition = triggerID * imageWidth; //Determines the distance the image reel needs to slide $(".paging a").removeClass('active'); //Remove all active class $active.addClass('active'); //Add active class (the $active is declared in the rotateSwitch function) //Slider Animation $(".image_reel").animate({ left: -image_reelPosition }, 500 ); }; //Rotation + Timing Event rotateSwitch = function(){ play = setInterval(function(){ //Set timer - this will repeat itself every 3 seconds $active = $('.paging a.active').next(); if ( $active.length === 0) { //If paging reaches the end... $active = $('.paging a:first'); //go back to first } rotate(); //Trigger the paging and slider function }, 7000); //Timer speed in milliseconds (3 seconds) }; rotateSwitch(); //Run function on launch //On Hover $(".image_reel").hover(function() { clearInterval(play); //Stop the rotation }, function() { rotateSwitch(); //Resume rotation }); //Hide the tooglebox when page load $(".desc").hide(); //slide up and down when hover over heading 2 $(".image_reel").hover(function(){ // slide toggle effect set to slow you can set it to fast too. $(this).next(".desc").slideToggle("slow"); return true; }); //On Click $(".paging a").click(function() { $active = $(this); //Activate the clicked paging //Reset Timer clearInterval(play); //Stop the rotation rotate(); //Trigger rotation immediately rotateSwitch(); // Resume rotation return false; //Prevent browser jump to link anchor });

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  • matlab write image into eps file

    - by Tim
    In MATLAB, how do you write a matrix into an image of eps format? It seems imwrite does not support eps? convert is not working on the Linux server I am using $ convert exploss_stumps.jpg exploss_stumps.eps convert: missing an image filename `exploss_stumps.eps' @ convert.c/ConvertImageCommand/2838 Any idea why?

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  • image slideshow example in android?

    - by UMMA
    dear friends, i want to create image slideshow in android. i have many images in android gridview now i want to open manual slideshow if any image is clicked so that i could view it by moving finger left or right next and previous images like android built in gallery. any one guide me how to achieve this? any help would be appriciated.

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  • Silverlight Marching Ants Image Selection

    - by Ben Herila
    (Silverlight 3) Is there a pre-existing (preferably free, even better if open source) method (either a control or source code) for dragging a "marching ants" style selection on an image in a ScrollViewer or on a Canvas, similar to how it's done in image editing software? Even better if the resulting selection box has adjustment handles.

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  • Row image changes in listview in android?

    - by sunil
    Hi, I am developing an android application where I need to manipulate the background image of the rows in listview on certain conditions. Initially when the listview is loaded all works properly. But when I scroll down to the listview and come up again the background image changes. Can someone tell me the reason why its happening so? Hope to get the reply soon. Regards Sunil

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