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January 2004
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2004.01.15 00:05 "Re: COLORMAP and byte padding", by Chris Cox
> > There is no support for alpha values in the TIFF colormaps, so you just > need to deal with the red, green and blue components. The individual > components are uint16's to give additional precision in color specification. > I have typically computed the 16bit value by multiplying the 8bit value > by 256, but that isn't really the most precise approach as 255 would not > quite become the maximum 16bit value (65535). Either shift left by 8 and or the values (val16 = (val8 << 8) | val8), or multiply by 257 (255 * 257 = 65535). Chris