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Ah,,,That makes since.  I did a little experiment and anded each of the red,
green, and blue values with
0xff to wipe out the high order bits...The values are now in the range of 0
to
255.

One curious note though.  If the largest number that could ever exist in a
Red
or Green or Blue component
is 255 why would libtiff have defined the values coming out of a call to
TIFFGetField as uint16*?
My only thoughts are maybe libtiff was written with strictly a "C" interface
in
mind and therefore function
overloading would not have been possible.  If they coded it for the largest
value that would ever be returned
from TIFFGetField then I guess uint16 is the right choice.

Thanks for the input.


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		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive January 2004 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 2004.01.15 17:16 "How to determine number of colors in the colormap", by Bill Cassanova 2004.01.15 18:44 "Re: How to determine number of colors in the colormap", by Joris Van Damme 2004.01.15 18:59 "Re: How to determine number of colors in the colormap", by Bill Cassanova 2004.01.15 19:50 "Re: How to determine number of colors in the colormap", by Joris Van Damme 2004.01.15 20:14 "Re: How to determine number of colors in the colormap", by Bill Cassanova 2004.01.15 21:32 "Re: How to determine number of colors in the colormap", by Joris Van Damme 2004.01.15 20:14 "Re: How to determine number of colors in the colormap", by Bill Cassanova Ah,,,That makes since. I did a little experiment and anded each of the red, green, and blue values with 0xff to wipe out the high order bits...The values are now in the range of 0 to 255. One curious note though. If the largest number that could ever exist in a Red or Green or Blue component is 255 why would libtiff have defined the values coming out of a call to TIFFGetField as uint16*? My only thoughts are maybe libtiff was written with strictly a "C" interface in mind and therefore function overloading would not have been possible. If they coded it for the largest value that would ever be returned from TIFFGetField then I guess uint16 is the right choice. Thanks for the input.

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2004.01.15 20:14 "Re: How to determine number of colors in the colormap", by Bill Cassanova