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

[Phyllis Smith]

And "Difference" looks perfect too.  And I erred earlier in suggesting that
Subtract and Difference are the same thing and obviously they are not.  My
Bad.

On Sat, Oct 1, 2022 at 6:36 PM Phyllis Smith <phylsmith2017 at gmail.com>
wrote:

>
> 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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