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2007.04.05 20:04 "Re: Floating point RGBA", by Toby Thain
On 5-Apr-07, at 4:58 PM, Craig Bruce wrote: > "Joris" <joris.at.lebbeke@skynet.be> wrote: > >> That seems like a very strange combination. If I remember correctly, >> packbits is a byte-based RLE scheme. Applied to floating point data, >> compression ought to be very inefficient. > > It may be a sensible option if the image has significant regions of > solid black. The IEEE floating-point representation of 0.0 is: 0x00, > 0x00, 0x00, 0x00 (in either endian). Dictionary compressors are much more likely to win, overall. RLE does seem an odd choice, regardless of the actual data characteristics. --Toby > > --------------------------+---------------------- > +-------------------------- > Dr. Craig S. Bruce | Ph 819-771-8303 x205 | > CubeWerx Inc. > Senior Software Developer | Fax 819-771-8388 | Gatineau, > Québec, Canada > csbruce@cubewerx.com | http://csbruce.com/ | http:// > www.cubewerx.com/ > --------------------------+---------------------- > +-------------------------- > "Hard work may not kill you, but why take chances?" > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/