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. <[email protected]>: > * oliver <[email protected]> [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. > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> https://lists.puredata.info/ > listinfo/pd-list >
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