[PD] [Gem] Modifying single pixel of pix image

[Roman Haefeli]

On Sam, 2017-04-08 at 08:29 +0200, Christof Ressi wrote:
> If it can be on the GPU, use a fragment shader! Do you work with a
> formula or do you set the alpha values by hand?

By Hand (maybe later by a formula). Is it possible?

The idea is to have two overlaying images. The visible one slowly
decomposes over time so that the image behind appears. I thought about
setting alpha to for more and more pixels as a way to decompose the
front image. Maybe there is another/better way?

Roman


> > Gesendet: Freitag, 07. April 2017 um 23:39 Uhr
> > Von: "Roman Haefeli" <reduzent at gmail.com>
> > An: pd-list at lists.iem.at
> > Betreff: [PD] [Gem] Modifying single pixel of pix image
> > 
> > Hi
> > 
> > Is it possible to manipulate a single pixel of a an image loaded by
> > [pix_image]? Specifically, I'd like to change the alpha value of
> > certain pixels. It doesn't matter to me whether the manipulation
> > happens in the pix realm or the GL realm. Currently I can think
> > only of
> > cumbersome ways like using [pix_dump] -> [pix_set] and applying the
> > manipulation to the largish list passed between them. Or by using
> > [pix_pix2sig~] -> [pix_sig2pix~] which is basically the same, but
> > would
> > allow to do the manipulation on a table.
> > 
> > Roman 
> >  _______________________________________________
> > Pd-list at lists.iem.at mailing list
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> > 
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