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I'm using GIMP 2.10.6 on Ubuntu 18.10.
I'm trying to script an automatic image manipulation, and for part of the workflow I need to dither a layer in my image.

I can't find anything in the script-fu/python-fu API that exposes the functionality provided by the dialogue located at Colors > Dither...

enter image description here

Am I missing something? Or does it just not exist?

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  • What do you mean by "anything that exposes the functionality"? Haven't you tried it on an image?
    – Billy Kerr
    Commented Jun 21, 2019 at 21:52
  • @BillyKerr, I've updated my question so hopefully it's a bit clearer. I am looking for a way to access this functionality from the python api.
    – jpheldson
    Commented Jun 21, 2019 at 21:55
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    On the contrary, this is a question about GIMP scripting functionality. Tags on this site such as "script", "batch-processing", "photoshot-scripting" and their related questions would suggest otherwise. I'm not asking about Python syntax or about coding practice, I'm asking about available features specific to a graphic design program.
    – jpheldson
    Commented Jun 21, 2019 at 22:18
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    Have a look at this thread on gimp-forum(dot)net. It would seem it doesn't exist, as you say.
    – Billy Kerr
    Commented Jun 21, 2019 at 22:35
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    Also there's a more specific python-fu tag available over at Stack Overflow - and as far as I can tell, user @xenoid has answered most of these. He also answers graphic design questions here. Hopefully he'll see this and can help more than me.
    – Billy Kerr
    Commented Jun 21, 2019 at 23:16

1 Answer 1

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The python-fu procedure is

pdb.gimp_levels(drawable, channel, low_input, high_input, gamma, low_output, high_output)

See the photo, I tested using the blue channel (number 3, as the procedure navigator explains) and my image got more blue!

tested! Works!

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  • I'm afraid not. That appears to be the "Colors > Levels..." dialog, particularly when working in one of the color channels. Dithering is a way to add perceived color depth by adding visual noise.
    – jpheldson
    Commented Apr 4, 2022 at 21:21

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