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September 2008
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2008.09.09 07:02 "Re: SAMPLEFORMAT_IEEEFP", by <acanicio@astrosnap.com>
Dear Bruce and Chris, Thank you ! I didn't know that floating point values had to be between 0 and 1 !! When converting to float, I kept the original range, i.e. 0..255 when coming from 8 bits, 0..65535 when coming from 16 bits, and 0..4294967295. What do you mean by "Use the exposure adjustment " ? Is there some specific tag for this or is it the same thing as scaling down ?. I see tag TIFFTAG_REFERENCEBLACKWHITE in the specifications. Is that it ? I'll try as you say, thank you very much to both of you. Best regards Axel Chris Cox wrote: > > > Use the exposure adjustment and scale the values down. > > Most of the time, you should scale your white point to something near 1.0 > to > ensure visibility. > > Chris > > > > > > On 9/7/08 4:18 PM, "acanicio" <acanicio@astrosnap.com> wrote: > >> But I have no luck with floating point values. I use SAMPLEFORMAT_IEEEFP >> sample format along with 32 bits per sample. >> All the pixel values are issued from an 8 bit/sample image, with no >> conversion or multiplication applied to them. >> When I open the file with some well known image editor, the image is >> completely saturated, all white with values 32767... >> Where should I look ? > > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/ > > -- View this message in context: http://www.nabble.com/SAMPLEFORMAT_IEEEFP-tp19363616p19386914.html Sent from the Tiff / LibTiff mailing list archive at Nabble.com.