get RGBA/ARGB of subtraction of 2 images

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  • jerone
    New Member
    • Nov 2007
    • 2

    get RGBA/ARGB of subtraction of 2 images

    I'm having two almost the same images. Only one has an extra transparent blueish circle over a part of the image, and the original not.

    How do I get the RGBA or ARGB of this circle (thus not the RGB)?

    I guess the original image should be subtracted form the modified image and from the result I want the RGB + alpha.

    If code is required I prefer .NET, but I just want it for one instance.
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