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need help with PixelSearch

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Im trying to do a pixelsearch for a particular pixel color.

However, depending on the browser or desktopsize, this pixel changes color ever so slightly:

ie, the red component changes by 15 shades, green component changes by 4 shades, and blue component stays the same.

If I were to do a Pixelsearch with tolerance set to 16, it will match a lot more pixels - and perhaps wrong pixels. Is there a built-in function or optimized 3rd party dll that I can specify the shade variance per color component?

Edited by jsteng

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