This command constructs an image from several grayscale images or layers, for instance from extracted RGB, HSV, etc. components. You can also build an image from grayscale images or layers created independently.
You can find this command in the image window menu under
→ → . It is enabled if your image is grayscale.Here you can select the color space to be used: RGB, HSV... The available options are described in the Decompose command.
Allows you to select which layer or image will be used for each channel. You may use this option, for example, to exchange color channels:
Mask Value: Instead of selecting a layer or an image to build the channel, you can give the channel a value from 0 to 255. But note that at least one channel must be formed from a layer or image.