[Cin] Some tests on blending

[Andrea paz]

> If you really want to compare RGBA with YUVA under Blend Algebra, then you
> have either to change COLORSPACE_RGB to COLORSPACE_YUV in the blend
> function, or to remove the 'COLORSPACE' declaration completely, or to change
> the colorspace parameter in the plugin dialog from the default 'by function'
> to the explicit 'RGB' or 'YUV' value. Have you done this?

No, I didn't. I knew that Blend Algebra uses float and RGB by default,
and it just seemed interesting to me to see the differences this makes
from patchbay (I chose YUV media on purpose, for the test, because
they are the most common). I would actually like to see all parts of
CinGG unified to the internal float engine and RGB color space, but I
know that is impossible, as each tool/plugin goes its own way. So I
think it is important to point out each time that with various tools,
various results can be achieved. I guess for programmers this is an
obvious and unnecessary aspect. But not to me. Another impossible
thing I would like to do is to indicate on the manual how each
tool/plugin works, regarding color spaces, color depths, and use of
the internal engine in float, but that is information available only
in very few cases.
In short, I think Blend Algebra is more reliable (consistent) than
patchbay overlays, because of its internal conversions to a single
mode; this is precisely why I would like to try IgorV's tutorial with
Blend Algebra again.
I guess I was just talking nonsense and doing useless tests!  :)

PS: @Phyllis; actually “polemica” is an intalian word I used, I don't
know why DeepL translated it into “polemic.”