LibTiff Mailing List

At 06:14 AM 3/30/00 , Ivo wrote:
> Rule of thumb: When saving the TIFF palette image, always save the r,g,b
> values (<256) as shifted 8 bits to the left.

Actually, they should be saved as (x<<8)+x so that white is 0xffff rather 
than 0xff00 (and so that levels are evenly distributed between 0x0000 and 
0xffff). Doesn't matter if all readers just shift, but anyone actually 
working in 48-bit color needs the extra bits.

Kind regards,
Phillip Crews
Cerious Software, Inc.
http://www.thumbsplus.com


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive March 2000 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 2000.03.30 11:14 "On 16 bit TIFF palette", by Ivo Penzar 2000.03.30 11:37 "Re: On 16 bit TIFF palette", by Peter Nielsen 2000.03.30 17:38 "Re: On 16 bit TIFF palette", by Phillip Crews 2000.03.30 17:38 "Re: On 16 bit TIFF palette", by Phillip Crews At 06:14 AM 3/30/00 , Ivo wrote: > Rule of thumb: When saving the TIFF palette image, always save the r,g,b > values (<256) as shifted 8 bits to the left. Actually, they should be saved as (x<<8)+x so that white is 0xffff rather than 0xff00 (and so that levels are evenly distributed between 0x0000 and 0xffff). Doesn't matter if all readers just shift, but anyone actually working in 48-bit color needs the extra bits. Kind regards, Phillip Crews Cerious Software, Inc. http://www.thumbsplus.com

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2000.03.30 17:38 "Re: On 16 bit TIFF palette", by Phillip Crews