image processing

image processing - alpha

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cmk128@hotmail.com - 16 Sep 2006 19:42 GMT

Hi
If two images with opacity 50% place over another, how to calculate
the final RGB?
thanks
from Peter (cmk28@hotmail.com)

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PofN - 16 Sep 2006 20:30 GMT

> Hi
> If two images with opacity 50% place over another, how to calculate
> the final RGB?

RTFM AlphaComposite

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Oliver Wong - 19 Sep 2006 19:56 GMT

> Hi
> If two images with opacity 50% place over another, how to calculate
> the final RGB?
> thanks
> from Peter (cmk28@hotmail.com)

Traditionally, you would start with some background layer (which may be
completely white, completely black, completely transparent, or something
else), merge the first layer onto that, treat the result as a single layer,
and merge the second layer onto that. I.e. they're treated like the
transparent ink cells that cartoonists use for animations.

If you wanted two images to be merged with each other, you'd probably
want the bottom one to have 100% opacity, and the top one to have 50%
opacity.

- Oliver

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