The Decompose tool will decompose a colour image into a series of grey scale layers. This allows you to edit the image in many different colour models.
Decompose[edit | edit source]
Go to Colours > Components > Decompose. This will bring up the Decompose Dialog.
The Decompose window looks like this:
Select the colour model that you wish to use from the drop down menu that matches the colour model you wish to split to.
Recompose[edit | edit source]
When done editing your image, select Colours > Components > Recompose, to recompose the image back into an RGB Image. When saving to the XCF format, the layers will be preserved.