On Wed, 2005-04-13 at 01:47 +0200, cedric wrote:
> I wonder why, when Opening or creating a document, there are only 3
> color channel and then, when creatin a layer, the alpha is coming. What
> this stand for ?

The default setting for a new document is the RGB colorspace with the
document filled with the background color; no transparency is needed.
When you add a layer, if you change nothing, the layer will be
transparent, so an alpha channel is required at that point and one will
be added.

You can set up a new document to have the background filled with
"transparency" (under the advanced options tab in the new image dialog
box) and then you will have an alpha channel from the start. However, if
you create a new layer filled with the background or foreground color,
that will still add an alpha channel if you do not have one in the
image, because there are always transparency options available for


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