Introduction to Layer Groups in GIMP 2.8

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Introduction to Layer Groups in GIMP 2.8

Layer Groups in GIMP 2.8
Layer Groups in GIMP 2.8. © Ian Pullen

In this article, I'm going to introduce you to the Layer Groups feature in GIMP 2.8. This feature may not seem like a big deal to many users, but anyone who has worked with images containing a large number of layers will appreciate how this can aid work flow and make complex composite images much more easy to work with.

Even if you don't work with masses of layers in your GIMP files, you can still benefit from understanding how Layer Groups work as they'll help you to keep files more manageable, particularly if you share your files with others.

This feature is just one of several changes that have been introduced with the upgraded GIMP 2.8 and you can read a bit more about this new release in our review of the new version of the popular and powerful free image editor. If it's some time since you last tried working with GIMP, there have been some big improvements, perhaps most noticeably the Single Window Mode that makes the interface more coherent.

Why Use Layer Groups?

Before focusing on why you may want to use Layer Groups, I want to offer a brief description of layers in GIMP for those users who aren't familiar with the feature.

You can think of layers as being like individual sheets of transparent acetate, each with a different image upon them. If you were to stack these sheets on top of each other, the clear transparent areas would allow layers lower down the stack to appear to give the impression of a single composite image. The layers can also easily be moved to produce different results.

In GIMP, the layers are also virtually stacked up on top of each other and by using layers with transparent areas, the lower layers will show through resulting in a composite image that can be exported as a flat file, such as a JPEG or PNG. By keeping the separate elements of the composite image on separate layers, you can later return to the layered file and easily edit it before saving a new flattened file. You'll especially appreciate this on those occasions when a client declares that they love it, but could you just make their logo a little bigger.

If you've only ever used GIMP for basic image enhancement, it's possible that you've never been aware of this feature and not used the Layers palette.

Using Layer Groups in The Layers Palette

The Layers palette is opened by going to Windows > Dockable Dialogs > Layers, though it will usually be open by default. My article on the GIMP Layers palette will give you more information on this feature, though this was written before the introduction of Layer Groups.

Since that article, the new Layers Group button has been added to the bottom bar of the Layers palette, to the right of the New Layer button and represented by a small folder icon. If you click on the new button, an empty Layer Group will be added to the Layers palette. You can name the new Layer Group by double clicking on its label and entering the new name. Remember to hit the Return key on your keyboard to save the new name.

You can now drag layers into the new Layer Group and you'll see that the group's thumbnail becomes a composite of all of the layers that it contains.

Just as with layers, you can duplicate groups by selecting one and clicking the Duplicate button in the bottom of the Layers palette. Also in common with layers, the visibility of a Layer Group can turned off or you can use the opacity slider to make the group semi-transparent.

Finally, you should notice that each Layer Group has a small button next to it with a plus or minus symbol in it. These can be used to expand and contract layer groups and they just toggle between the two settings.

Try it For Yourself

If you've not used layers in GIMP before, there's never been a better time to give them a go and see how they can help you to produce creative results. If, on the other hand, you're no stranger to layers in GIMP, you should need no prompting to make the most of the extra power that Layer Groups brings to this popular image editor.