gamma - grayscale filter

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ChrML

I did a working grayscale function a long time ago in 5 min. Since all grayscale pictures has equal RGB values (very obvious), you can do this perfectly by taking each pixel from the src image, find the middlevalue (basic math: m=rgb/3) of RGB, and write that value as RGB to dest image at same pixel. 20,10,60 at org pic would ie be 30,30,30 on dest pic. I'm sure u understand.