Get a preview jpeg of a pdf on windows?
I have a cross platform (python) application which needs to generate a jpeg preview of the first page of a PDF. On the mac I am spawning sips. Is there something similarly simple I can do on Windows? ...
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Locating Text within image
I am currently working on a project and my goal is to locate text in an image. OCR'ing the text is not my intention as of yet. I want to basically obtain the bounds of text within an image. I am using the AForge.Net imaging component for manipulation. Any assistance in some sense or another? Update 2/5/09: I've since went along another ...
Storing Images in DB - Yea or Nay?
So I'm using an app that stores images heavily in the DB. What's your outlook on this? I'm more of a type to store the location in the filesystem, than store it directly in the DB. What do you think are the pros/cons? ...
Efficient JPEG Image Resizing in PHP
What's the most efficient way to resize large images in PHP? I'm currently using the GD function imagecopyresampled to take high resolution images, and cleanly resize them down to a size for web viewing (roughly 700 pixels wide by 700 pixels tall). This works great on small (under 2 MB) photos and the entire resize operation takes less...
Increasing camera capture resolution in OpenCV
In my C/C++ program, I'm using OpenCV to capture images from my webcam. The camera (Logitech QuickCam IM) can capture at resolutions 320x240, 640x480 and 1280x960. But, for some strange reason, OpenCV gives me images of resolution 320x240 only. Calls to change the resolution using cvSetCaptureProperty() with other resolution values just ...
How do I convert a file path to a URL in ASP.NET
Basically I have some code to check a specific directory to see if an image is there and if so I want to assign a URL to the image to an ImageControl. if (System.IO.Directory.Exists(photosLocation)) { string[] files = System.IO.Directory.GetFiles(photosLocation, "*.jpg"); if (files.Length > 0) { ...
IE6 - can't load a normal JPG
Try loading this normal .jpg file in Internet Explorer 6.0. I get an error saying the picture won't load. Try it in any other browser and it works fine. What's wrong? The .jpg file is just a normal picture sitting on the web server. I can even create a simple web page: <a href="http://www.zodiacwheels.com/images/wheels/blackout_thumb.jp...
Click an image, get coordinates
I know it can be done and I even have a vague idea of how to do it but it stops at being vague. I have a standard HTML image tag with an image in it, 100 by 100 pixels in size. I want people to be able to click the image and for that to pass the X and Y that they click into a function. The coordinates need to be relative to the image t...
Preventing a visitor from saving an image from my site.
What are some effective strategies for preventing the use of my proprietary images? I'm talking about saving them, direct linking to them etc... Presently I have a watermark on the image, but I'd rather not. .NET platform preferred, but if there's a strategy that's on another platform that integrates with my existing application that'...
How do i resize and convert an uploaded image to a PNG using GD
I want to allow users to upload avatar-type images in a variety of formats (GIF,JPEG,PNG at least), but to save them all as PNG database BLOBs. If the images are oversize, pixelwise, i want to resize them before DB-insertion. What is the best way to use GD to do the resizing and PNG conversion? Edit: Sadly, only GD is available on the ...
How do I convert images between CMYK and RGB in ColdFusion (java)?
I have a need to convert images from CMYK to RGB - not necessarily back again, but hey, if it can be done... With the release of ColdFusion 8, we got the CFImage tag, but it doesn't support this conversion; and nor does Image.cfc, or Alagad's Image Component. However, it should be possible in Java; which we can leverage through CF. For...
What algorithm to compare two images
Hello! My task is pretty simply (well, it SOUNDS simple): given two different image file (in whatever format I choose), I need to write a program to predict the chance if one is the illegal copy of another. The author of the copy may do stuffs like rotating, make negative, or adding trivial details (as well as changing the dimension of ...
Use QItemDelegate to show image thumbnails
What's the best way to use QT4's QItemDelegate to show thumbnails for images in a view? Specifically, how do you stop the item delegate from blocking when generating pixmaps from very large image files (> 500MB)? Can anyone link to some example code that achieves this? Then again, perhaps this isn't the place to look for Qt-specific c...
Images in PHP
Is it possible to create images with PHP (as opposed to simply linking to them via HTML) and if so, where should I go first to learn about such a thing? ...
How can I measure the similarity between two images?
I would like to compare a screenshot of one application (could be a Web page) with a previously taken screenshot to determine whether the application is displaying itself correctly. I don't want an exact match comparison, because the aspect could be slightly different (in the case of a Web app, depending on the browser, some element coul...
What is the "best" way to create a thumbnail using ASP.NET?
Story: The user uploads an image that will be added to a photo gallery. As part of the upload process, we need to A) store the image on the web server's hard drive and B) store a thumbnail of the image on the web server's hard drive. "Best" here is defined as Relatively easy to implement, understand, and maintain Results in a thumb...
Resize transparent images using C#
Does anyone have the secret formula to resizing transparent images (mainly GIFs) without ANY quality loss - what so ever? I've tried a bunch of stuff, the closest I get is not good enough. Take a look at my main image: http://www.thewallcompany.dk/test/main.gif And then the scaled image: http://www.thewallcompany.dk/test/ScaledImage...
Java Swing: Displaying images from within a Jar
When running a Java app from eclipse my ImageIcon shows up just fine. But after creating a jar the path to the image obviously gets screwed up. Is there a way to extract an image from the jar at runtime so I can then open it up? Or, is there a better way to do this? I'd like to distribute a single jar file if possible. ...
How can I take a byte array of a TIFF image and turn it into a System.Drawing.Image object?
I have a byte[] array, the contents of which represent a TIFF file (as in, if I write out these bytes directly to a file using the BinaryWriter object, it forms a perfectly valid TIFF file) and I'm trying to turn it into a System.Drawing.Image object so that I can use it for later manipulation (feeding into a multipage TIFF object) The ...
How can I render a PNG image (as a memory stream) onto a .NET ReportViewer report surface
I have a dynamically created image that I am saving to a stream so that I can display it on a ReportViewer surface. Setup: Windows Client application (not WebForms) Report datasource is an object datasource, with a dynamically generated stream as a property (CustomImage) Report.EnableExternalImages = true Image.Source = Database Ima...