PHP: color overlay with Hue blend mode

Can anyone tell me how in PHP, I can do the same effect as in Adobe Photoshop - Color overlay->Blend mode:Hue

This thing colorizes all colorful pixels (non-grascale ones). I need it for my project - http://iconizer.net . I managed to make the colorisation, but it paints the gray shadows too. I need shadows and other grayscale pixels to be left untouched. I can do it with pixel-by-pixel scanning, but it's crazy. There has got to be a simpler solution. Does anyone know it?

Thanks in advance.

Solution

Use a specialized image editing tool such as imagemagick. Then get PHP to call it with your wanted options. It will be much faster, and save you a lot of hassle.

http://www.imagemagick.org/script/index.php

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