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

[Andrew Randrianasulu]

сб, 1 окт. 2022 г., 23:01 Phyllis Smith <phylsmith2017 at gmail.com>:

> 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 ...?




> 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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