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April 2008
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2008.04.18 12:53 "Re: a question about creating transparency of the image in TIFF", by Edward Lam
Bob Friesenhahn wrote: > On Thu, 17 Apr 2008, Chris Cox wrote: >> Also, the TIFF spec. states that images with associated alpha >> (transparency) >> must be premultiplied. > > The TIFF specification does not prevent a colormapped file with > transparency but the colors in the colormap would then need to be > premultiplied, which could be a challenge to surmount. As a result, no > one does this. Sorry, I don't understand this. We output TIFFs with premultiplied RGB colors and associated alpha. How is this a "challenge"? -Edward