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November 2008
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2008.11.11 17:28 "Error in initial post for PLANARCONFIG == SEPARATE", by Richard Nolde
> > 1. Writing scanlines with PLANARCONFIG == SEPARATE (Richard Nolde) There was an error in my initial post that made my intent unclear: > Since the data are compressed/stored on a per scanline basis, I wanted > to write the data for each sample of a given row of the image to > successive scan lines within one strip to speed up access when only a > part of the image is being used. > Strip 1 > Scanline 1 RRRRRRRRR > Scanline 2 GGGGGGGG > Scanline 3 BBBBBBBBB > should have been Strip 1 Scanline 1 RRRRRRRRR Scanline 1 GGGGGGGGG Scanline 1 BBBBBBBBB Scanline 2 RRRRRRRRR Scanline 2 GGGGGGGGG Scanline 2 BBBBBBBBB Scanline 3 RRRRRRRRR Scanline 3 GGGGGGGGG Scanline 3 BBBBBBBBB Another possibility would be Strip 1 Scanline 1 RRRRRRRRR Scanline 2 RRRRRRRRR Scanline 3 RRRRRRRRR Scanline 1 GGGGGGGGG Scanline 2 GGGGGGGGG Scanline 3 GGGGGGGGG Scanline 1 BBBBBBBBB Scanline 2 BBBBBBBBB Scanline 3 BBBBBBBBB Strip 2 ... I guess the problems is that the TIFF Spec doesn't provide any way to distinguish among these layouts so a reader would have no way to know which sequence they represent. It looks like PLANNARCONFIG == SEPARATE is an all or nothing model. Richard Nolde