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Grokking The Gimp
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5.9 Common Problems and
Frequently Asked Questions

The following are a few common problems that arise when working with colorspaces and blending modes:

  • I want to apply a blending mode with the Paintbrush (Pencil, Bucket Fill, and so on) tool. Although I've set the blending mode in the Layers dialog it doesn't seem to work.

    The problem is that the blending modes for the painting tools are controlled from the Brush Selection dialog, not from the Layers dialog. Type C-S-b in the image window or click on the Active Brush in the Toolbox window to bring up this dialog.

  • I'm using the Paintbrush (Pencil, Bucket Fill, and so on) tool, and I'm getting strange color results. What's going on?

    Check that the Brush Selection dialog's blending mode is set to Normal.

  • I want to color a black-and-white image, but no matter what color I apply it comes out as a shade of gray in my image. Why?

    You are working on a grayscale format image. Convert the image to RGB by selecting the function RGB from the Image:Image/Mode menu.

Grokking The Gimp
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