[PD] some GEM questions ...

[Py Fave]

i saw this :

https://mouaif.wordpress.com/2009/01/05/photoshop-math-with-glsl-shaders/

2017-04-12 21:41 GMT+02:00 Peter P. <peterparker at fastmail.com>:

> * oliver <oliver at klingt.org> [2017-04-12 14:21]:
> > hi, dear list !
> >
> > i'm looking for an insight into some questions i ran into recently when i
> > decided to give GEM a serious shot after all.
> > please be patient, i'm probably spoiled by JITTER ...
> >
> > PD 0.47.1
> > GEM 0.93.3
> > WINDOWS 7/64bit
> >
> > 1.) is there a way to do image processing (i.e. levels, contrast,
> > satturation etc.) on the GPU ?
> >
> > as far as i understood [pix_...] objects do all their processing with the
> > CPU
> > and others like [color] do it in openGL (thus GPU), is that right ?
> > now, for big textures (1280x720 or bigger) that would be the preferable
> way
> > of manipulating things, right ?
> Asking a similar question recently on this list I got told that a lot is
> possible using shaders. See if you have a folder named 10.glsl on your
> OS somewhere that could hold Gem examples for shaders.
>
> Searching the mailing list archive
> https://lists.puredata.info/pipermail/pd-list/
> for "shaders"
> https://lists.puredata.info/search?P=shaders&G=Pd-list&
> HITSPERPAGE=20&SORT=-1
> might give you results as well.
>
> > 2.) i'm looking for objects that do "compositing", i.e. ways to overlay
> two
> > pix sources. apart from the ones existing (add, multiplay, subtract,
> mix) ,
> > i would love to have the well-known (AE,vegas, etc.) compositing modes
> like
> > "darken", "lighten", "dodge" "difference" etc. - but also chromakeying !
> >
> > is this possible ? and is it possible to do in opengl rather than with a
> > [pix_] object ?
>
> Look for help patches
>         12.blending.pd
>         13.maskDancer.pd
>         14.takeAlpha.pd
>         15.pix_alpha.pd
>
> and the [pix_chroma_key] object and its documentation perhaps.
>
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