[Cin] oops apparently 'subtract' mode is broken!

Phyllis Smith phylsmith2017 at gmail.com
Sun Oct 2 02:36:21 CEST 2022

> BUT Subtract mode when using the Red/Green png's does not appear to be
>> correct.  I will keep analyzing.
> I think difference might be due to alpha channel in pngs ...?
Maybe, but in doing more tests I see that Addition looks 100% correct.  I
just started using capture of their files.  See Addition attached with
URL's on the left and CinGG on the right.
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