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May 2004
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2004.05.18 13:13 "Re: Further doubt on bits per sample", by Frank Warmerdam
mayankg@iiitb.ac.in wrote: > Hi, > Thanks for the reply, > > I further have a doubt, > 1. How does the bits per sample cases of 1,4 or 5 are handled by the libtiff > library? Does the readstrip/readtile functions return the data, such that, the > pixel values are always packed in byte boundaries? Mayank, Pixels are packed into the bytes, and in the case of odd numbers of bits per sample would potentially span bytes. > i.e. for bits per sample case of 4, are two pixel values clubbed into one byte > or one byte always contains one pixel value only? > Or lets say for bits per sample case of 5 or 9, a pixel value is contained in a > byte or a word respectively. In the case of 1, 2 or 4 bits per sample there would be 8, 4 or 2 pixels stored in each byte > 2. Does the same scheme (as for readstrip/readtile) applies for > writestrip/writetile functions? Yes. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent