### 2.7. You are trying to act on a layer group

图 4.5. Layer group selected

Layers dialog where a layer group is selected.

How to tell: Check the Layers Dialog to see if the active layer is actually a Layer group. When a layer group is not empty, a small icon or appears in front of the layer group's thumbnail and name. Most actions don't work on a layer group, in which case an error message will show up: “Cannot paint on layer groups.”

How to fix: You need to make a layer active that is not a layer group. Select a layer by clicking it in the Layers Dialog. If the active layer group has a + sign in front of it, it is collapsed. You can click it to expand and show the individual layers inside that group.

2.6. 您试图在层外操作 |  | 2.8. 图像处于索引颜色模式。

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