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

Christof Ressi christof.ressi at gmx.at
Sat Apr 8 08:29:01 CEST 2017

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?

> 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 
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