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2006.09.15 17:46 "Re: alpha in Grayscale or Palette", by Ed Grissom
Gerben - For palette images, is an alpha channel explicitly forbidden by the spec? What I am thinking is an extra data plane, not an extra column in the color table. Transparency and especially translucency are not always tied to the color of a pixel (which would be the effect of the extra column in the colortable), rather, it is often tied to position in the image (i.e. vignettes around the edges) In that case, the advice for palette images would be the same as your advice for the greyscale images. -- ed grissom ed.grissom@intergraph.com