[Cin] Some tests on blending

[Georgy Salnikov]

On Sat, 29 Mar 2025, Andrew Randrianasulu wrote:

> I wonder if limitation more about displaying results here relative to
> processing algo? We can make histogram 2x longer, but what if generated
> result STILL out of new range? I wonder how other software solves it ....

With BlendProgram one can directly test whether some particular effect clips
colors or not.

Set project colorspace to RGB(A)-Float.

Attach a blend program (just to this single track) which fills all pixels
with some solid color with the value out of bounds (for example, R=2.0,
G,B=0.0, A=1.0). I think, A=1 is important as it could be taken as an
additional multiplier. Don't forget to switch off clipping also in the
BlendProgram dialog.

Then attach the effect in question.

Then attach the second blend program which prints in console the value of R
and changes nothing. You will clearly see how the color R=2.0 was modified
by the plugin in the middle between the two BlendPrograms.
_______________________________________________________________________________

Georgy Salnikov
NMR Group
Novosibirsk Institute of Organic Chemistry
Lavrentjeva, 9, 630090 Novosibirsk, Russia
Phone   +7-383-3307864
Email   sge at nmr.nioch.nsc.ru
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