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Useful Modules/Classes in GIMP 3.0+

Here's a guide to the modules you're likely to need. It's a work in progress: feel free to add to it.

Eventually we'll have online documentation for these classes. In the meantime, you can generate your own:

HTMLDOCDIR=/path/to/doc/dir
g-ir-doc-tool -I /path/to/share/gir-1.0/ --language=Python -o $HTMLDOCDIR Gimp-3.0.gir

Then browse $HTMLDOCDIR with yelp, or generate HTML from it:

cd $HTMLDOCDIR
yelp-build cache *.page
yelp-build html .

You can also get some information in GIMP's Python console with help(module) or help(object), and you can get a list of functions with dir(object).

Gimp

The base module: almost everything is under Gimp.

Gimp.Image

The image object.

Some operations that used to be PDB calls, like

pdb.gimp_selection_layer_alpha(layer)

are now in the Image object, e.g.

img.select_item(Gimp.ChannelOps.REPLACE, layer)

Gimp.Layer

The layer object.

fog = Gimp.Layer.new(image, name,
                     drawable.width(), drawable.height(), type, opacity,
                     Gimp.LayerMode.NORMAL)

Gimp.Selection

Selection operations that used to be in the PDB, e.g.

pdb.gimp_selection_none(img)

are now in the Gimp.Selection module, e.g.

Gimp.Selection.none(img)

Gimp.ImageType

A home for image types like RGBA, GRAY, etc:

Gimp.ImageType.RGBA_IMAGE

Gimp.FillType

e.g. Gimp.FillType.TRANSPARENT, Gimp.FillType.BACKGROUND

Gimp.ChannelOps

The old channel op definitions in the gimpfu module, like

CHANNEL_OP_REPLACE

are now in their own module:

Gimp.ChannelOps.REPLACE

Gegl.Color

In legacy plug-ins you could pass a simple list of integers, like (0, 0, 0). In 3.0+, create a Gegl.Color object:

    c = Gegl.Color.new("black")
    c.set_rgba(0.94, 0.71, 0.27, 1.0)

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