O'Reilly logo

The Book of GIMP by Karine Delvare, Olivier Lecarme

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

D.3 Why...?

Why are some of the filter names grayed out?

Most filters apply only to RGB images. Check the status of Image: Image > Mode and change it to RGB if needed. A few filters have other requirements. For example Image: Filters > Enhance > NL filter is grayed out if the current layer has an Alpha channel.

Why is nothing happening?

If you’re trying to edit an image and your actions seem to have no effect, check the following points:

  • Is there a floating selection? If so, you need to either delete the floating selection or place it into a layer before doing anything else.

  • Is the layer you want to change the active layer? The active layer is emphasized in the Layers dialog.

  • A selection may not be visible either because it is too small or because it ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required