[Cin] User Defined Blend Algebra

[Georgy Salnikov]

On Sat, 15 Feb 2025, Andrea paz wrote:

> Nice examples are also ydiff; swap and transition. The chromakey seems
> to me comparable to CGG's classic chromakey and not avid's. The
> ability to replace the background via Blend Program is great, though.

I have intentionally chosen several example functions from totally different
areas of application, to demonstrate that a user-programmable plugin is a
really universal toy and can appear handy even in unexpected cases. If a
user needs to tinkern some play with colors or layers and does not know
which of the dedicated plugins should help, he can think "Could I firstly
try something like this with a blend program?"

Even a programmer can sometimes make use of this approach when creating new
effects. Here one can much more quickly test different combinations without
spending time to restart CinGG, recompile it, reload project, reattach
plugins, etc.

Blendprogram chromakey was also implied as a remarkable example to
demonstrate that even complex things sometimes may be expressed in extremely
simple form, in only several lines of text. Can it be used in a real video
production? Not obvious. In no way can it replace ChromakeyAvid or something
like this. But one can in principle play with the expression in it to tune
the sensitivity on the hue difference, for example, or even combine the
found expression with further plugins, like alpha smoothing, etc., who
knows?

_______________________________________________________________________________

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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