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

[Phyllis Smith]

BUT Subtract mode when using the Red/Green png's does not appear to be
correct.  I will keep analyzing.

On Sat, Oct 1, 2022 at 12:43 PM Phyllis Smith <phylsmith2017 at gmail.com>
wrote:

> Preliminary results show Subtract (Difference) mode is working same as in
> this url as Andrew quoted.  See attached where compare3.gif shows the URL's
> difference with Cinelerra subtract below and input.gif shows CinGG input
> files.
>
>> according to this
>>
>> https://emptyeasel.com/2008/11/14/layer-modes-part-three-difference-addition-subtraction-darken-lighten/
>>
>> color inversion in subtract mode IS normal thing.
>>
>> yet in original Cin something else happens ....
>>
>>
>> may be Phyllis can replace our original red-green square  images with
>> full-color gradients + photo, so effect will be more natural? Or add this
>> into new appendix .....
>>
>>
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