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

[Phyllis Smith]

Interesting results.  I will try to understand and October is going to be
"look into Overlays"!  Will use your attached files.

On Wed, Sep 28, 2022 at 7:38 AM Andrea paz <gamberucci.andrea at gmail.com>
wrote:

> I tried all 30 patchbay overlays. 17 out of 30 are wrong. I attach the
> 2 sources used (rosso.png and verde.png) plus the project xml if
> anyone wants to repeat the tests. I also attach the screeshots of the
> 17 wrong overlays so you can compare them with the ones given in the
> manual.
> You can see that the overlapping area is almost always right. The
> problem comes up with the non-overlapping parts, I don't understand
> why. You have to do the calculations to figure out what the right
> result is and why you don't get it....
> I remember the RGB values of green and red that I used as sources (I
> sampled them from the "normal" image in the manual):
>
> green: 0.1020  0.8078  0.2980
>
> red:     0.7333  0.1686  0.2980
>
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