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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.
Online documentation for our libraries can be found at:
https://developer.gimp.org/api/3.0/
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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