Hi, "Adam D. Moss" <adam@xxxxxxxx> writes: > I bet to differ -- the top three or four 'channels' ARE channels, > and the rest AREN'T. The rest are, as you describe, 'saved selection > masks'. I guess they're historically in the same dialog because > Photoshop liked to pretend that saved selection masks were 'auxilliary > channels' (barf), and AFAIK practically no-one found a real use for > genuine 'auxilliary channels' (probably good for spot colours, but > I'm guessing that ironically, Photoshop then proceeded to handle > spot colours differently anyway). Well, of course you are right. But in order to avoid further confusion I used the term "channel" to describe the GimpChannel object as well as the corresponding wrapper struct in libgimp. This is what the plug-in API exposes as channels even though perhaps the name choice is rather unfortunate. Sven