Hello,

Please add GDK_COLORSPACE_GRAYSCALE. And why not GDK_PIXBUF_INDEXED in order to have b&w pictures.

Here is a use case. I'm developping GnomeScan libraries. Scan is possible in different colorspace including RGB, GrayScale and Black&White. That allow to save a lot of bandwidth and space in memory. Of course, i use a GdkPixbuf to reprensent acquired pictures. But since GdkPixbuf only implement RGB, representing a GrayScale picture grows 3 times in memory :(

I guess that grayscale is the more important and esier to implement that Indexed.

Thanks.