### 2.9. No visible effect when trying to use a brush, eraser or other tool

How to tell: You are trying to use the brush or eraser but you are not seeing anything changing.

How to fix: Check the Tool Options and make sure that Opacity is not set to 0.

2.8. 图像处于索引颜色模式。 |  | 2.10. No visible effect when trying to use the move tool, rotate or other transform tool

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