Alpha Channels

[micahalhadeff]

Hello,

I was wondering if any of the scripts can include images with alpha channels? Amazing scripts!

[genmeblog]

Hi! Thanks! Definitely some of the can include processing an alpha channel with some code change. Any specific script?

[micahalhadeff]

I would love to be able to use the png glitch script with images that contain an alpha channel :) but I don't want the whole image to have a 90% opacity for example, I am looking for an option that basically retains the original alpha channel areas if that makes sense.

[genmeblog]

I haven't verified it yet but you can try to replace this line:

https://github.com/tsulej/GenerateMe/blob/master/pngglitch/pngglitch.pde#L107

with

         color c = ImageLineHelper.getPixelARGB8(line,y);

It should retain (not affected by glitches) alpha channel.

[micahalhadeff]

I replaced it, but it still saves with a black opaque background.

[genmeblog]

Ah, I see. Remove the line which sets black background, here:

GenerateMe/pngglitch/pngglitch.pde

Line 63 in 29d60da

buffer.background(0);

(Currently I have no access to pc to verify this).

[micahalhadeff]

Fantastic it works!! Although it does produce some noise around the alpha area in some places, Is there a way to get rid of that?

[genmeblog]

Good! Regarding noise, all glitches are on the codec side, so I don't know what to do to get rid of them.

[micahalhadeff]

All good, if I decrease the file size it gets rid of the noise. Thank you so much for your help!!

[micahalhadeff]

I would love to be able to use the png glitch script with images that contain an alpha channel :) but I don't want the whole image to have a 90% opacity for example, I am looking for an option that basically retains the original alpha channel areas if that makes sense.

…

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