I am working with the code from Dondragmer's 'Rotated Hue' example from this question: How to programmatically change the hue of UIImage? However, I am getting very different results than what I'd expect. I'm expecting the hue change to give…
I want to make a effect that a colored normal image to a scanned image. like 2 pictures below, first image is the original image, second image is the adjusted image, effects should like the second image, the text on…
I'm trying to reproduce Photoshop's multiply blend mode in OpenCV. Equivalents to this would be what you find in GIMP, or when you use the CIMultiplyBlendMode in Apple's CoreImage framework. Everything I read online suggests that multiply blending is accomplished…
I'm trying to add some color correction to images in my Mac app using Core Image filters. First, I'm looking at allowing a custom white-balance, to remove a cast from an image. It looked like the CIWhitePointAdjust was exactly what…
Using GPUImage I am trying to replicate Photoshop Lighten Blend Mode with opacity. Unfortunately the alpha channel has no effect using the GPUImageLightenBlendFilter. Brad confirms there might problems with alpha: GPUImage's GPUImageOpacityFilter not behaving as expected, doesn't change alpha channel…