In order to do effects which involve alpha channels, a colormodel with an alpha channel must be selected.
These are RGBA-8 bit, YUVA-8 bit, and RGBA-Float.
The 4 channel colormodels are slower than 3\,channel colormodels, with the slowest being RGBA-Float.
In order to do effects which involve alpha channels, a colormodel with an alpha channel must be selected.
These are RGBA-8 bit, YUVA-8 bit, and RGBA-Float.
The 4 channel colormodels are slower than 3\,channel colormodels, with the slowest being RGBA-Float.