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I've been 3 days searching for documentation about python-fu for GIMP 2.8, and the one I find is great, but deprecated.

So I'm now stuck at this place: I've created 3 color channels, and want to add each one of them as a mask to each of 3 layers.

What I've done till now: (manually load the image, and create 3 color channels for lights, middle tones and shadows);

Get it's ID, with:

ima = gimp.image_list()[0]

Get the layer ID and duplicate the layer 3 times:

layn = pdb.gimp_layer_new_from_visible(ima, ima, 'dup')
pdb.gimp_image_insert_layer(ima, layn, None, -1) 

Now I have an image with three layers and want to add a layer mask to each of the 3 layers but from the 3 different color channels... but I don't know how.

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The API doesn't seem to support creating a mask directly from a random channel. But you can create a mask from the selection, so:

  1. Copy your channel into the selection

    pdb.gimp_image_select_item(image,CHANNEL_OP_REPLACE,channel)
    
  2. Create the mask

    mask=layer.create_mask(ADD_SELECTION_MASK)
    
  3. Add the mask to the layer:

    layer.add_mask(mask)
    
  • 1
    Of course, but here the question is to create a layer mask, not a layer. – xenoid Aug 28 '17 at 16:32

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