image-manipulation

How can I tint/colorize an image in WPF (using MVVM) without sacrificing performance? A purely XAML solution would be ideal, as modifying bitmaps in the code will cause performance loss with lots of changing images. The image is made up of more than simple shapes, so it is not possible using a path. Cyral Unlike WinForms/GDI+, WPF does not seem to contain any easy ways to colorize/tint an image as it is being rendered. Two ideas for accomplishing this are, using a shader, or overlaying a colored rectangle over the image. I decided to try the rectangle route and found that it works. Basically,

I'm looking to do something like this but with CSS or JavaScript. I need to highlight a certain part of an image but everything I find is how to do it in Photoshop. Can I do this with CSS or maybe JavaScript? Am I even asking the right question? EDIT: Well here is a great submission but I have a follow up question: I need this for a mobile device and portrait and landscape views as well for many devices like: iOS, iPad, Android, WebOS, Etc... So the fixed position I'm not sure will work. Any advice? You could use background-position with absolutely positioned divs as follows: CSS: .container {

I've heard that it should be possible to do a lossless rotation on a jpeg image. That means you do the rotation in the frequency domain without an IDCT. I've tried to google it but haven't found anything. Could someone bring some light to this? What I mean by lossless is that I don't lose any additional information in the rotation. And of course that's probably only possible when rotating multiples of 90 degrees. mpenkov You do not need to IDCT an image to rotate it losslessly (note that lossless rotation for raster images is only possible for angles that are multiples of 90 degrees). The

Are there any classes, methods in the .NET library, or any algorithms in general, to perform non- affine transformations? (i.e. transformations that involve more than just rotation, scale, translation and shear) e.g.: (source: last100.com ) Is there another term for non-affine transformation s? All of the example images you posted can be done with a Quadrilateral Distortion. Though I cant say for certain that a quad distort will cover ALL non affine transforms. Heres a link to a not so good implementation of it in C#... it works, but is slow. Poke around Wikipedia for the many different

I am running running a script which moves an uploaded file with move_uploaded_file() . I have done this thousands of times but for some reason it's not working. I have confimred the following: <form> using method="post" and correct enctype correct file referenced from form directory has permissions 777 all the memory_limit , max_execution_time , etc are set to super high settings to avoid timeouts Basically, the script below returns with just Your image is too big. . I have also enabled ALL errors to display and still don't get an error. Any ideas? $time = time(); $target_path = "/absolute