Can we find out the difference between 2 RGb colors to find out a 3rd color?

Posted by AK on Stack Overflow See other posts from Stack Overflow or by AK
Published on 2010-03-05T03:57:31Z Indexed on 2010/03/15 13:19 UTC
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rgb

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2 colors are mixed together. If i have the RGB for the resultant color and RGB for one of the colors mixed, then somehow i could calculate the 2nd color?

I will try to explain visually what i am trying to say. Here is a flickr link

http://www.flickr.com/photos/48150615@N08/4407414157

I know that the circle in the middle has an opacity of 20%

Is there any way to know the color value of the circle so that i can deduct that to get the same color value as the background color.

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