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apply the changes. With Reset, restore the original settings. Cancel aborts level adjust-
ment.
18.5.5 Undoing Mistakes
Most modifications made in The GIMP can be undone. To view a history of modifica-
tions, use the undo dialog included in the default window layout or open one from the
toolbox menu with File > Dialogs > Undo History.
The dialog shows a base image and a series of editing changes that can be undone. Use
the buttons to undo and redo changes. In this way, you can work back to the base image.
If you undo a modification then make a new one, the undone modification cannot be
redone.
Changes can also be undone and redone with the Edit menu. Alternatively, use the
shortcuts Ctrl + Z and Ctrl + Y .
18.5.6 Layers
Layers are a very important aspect of The GIMP. By drawing parts of your image on
separate layers, change, move, or delete those parts without damaging the rest of the
image. To understand how layers work, imagine an image created from a stack of
transparent sheets. Different parts of the image are drawn on different sheets. The stack
can be rearranged, changing which parts are on top. Individual layers or groups of layers
can shift position, moving sections of the image to other locations. New sheets can be
added and others set aside.
Use the Layers dialog to view the available layers of an image. The text tool automati-
cally creates special text layers when used. The active layer is highlighted. The buttons
at the bottom of the dialog offer a number of functions. More are available in the menu
opened when a layer is right-clicked in the dialog. The two icon spaces before the image
name are used for toggling image visibility (eye icon when visible) and for linking
layers. Linked layers are marked with the chain icon and moved as a group.
Only layers with transparency (an alpha channel) can be placed above other layers in
a stack. To add this to a layer, right-click and select it from the menu.
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KDE User Guide
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Table of Contents
Troubleshooting
