AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2004.08.11 23:17 "[Tiff] From bmp to Tiff", by Bob Lakkakula
2004.08.12 14:32 "Re: [Tiff] From bmp to Tiff", by Bob Friesenhahn
2004.08.12 15:05 "Re: [Tiff] From bmp to Tiff", by Joris
2004.08.12 15:15 "Re: [Tiff] From bmp to Tiff", by Jay Berkenbilt
2004.08.12 15:38 "Re: [Tiff] From bmp to Tiff", by Joris
2004.08.12 15:23 "Re: [Tiff] From bmp to Tiff", by Bob Friesenhahn
2004.08.12 15:49 "Re: [Tiff] From bmp to Tiff", by Joris
2004.08.12 17:05 "Re: [Tiff] From bmp to Tiff", by Chris Cox
2004.08.12 21:07 "Re: [Tiff] From bmp to Tiff", by Andrey Kiselev
2004.08.12 21:58 "Re: [Tiff] From bmp to Tiff", by Joris
2004.08.12 23:05 "Re: [Tiff] From bmp to Tiff", by Bob Friesenhahn
2004.08.12 23:21 "Re: [Tiff] From bmp to Tiff", by Joris

2004.08.12 15:23 "Re: [Tiff] From bmp to Tiff", by Bob Friesenhahn

** color space **

Some people will dissagree, but in my opinion, 'blending' colors, or any color calculation like the 'pixel area averaging' described above, is an operation that only makes sense to the human eye. That is why, I think, you need a color space that makes sense to the human eye. CIE L*a*b* is most suitable in my experience. The further away from such a perceptually uniform color space, the less pleasing the results. For instance, RGB might still be relatively usefull for such algorithms, CMYK might not.

For image resizing, I am one of those who disagree. Image resizing is almost always done on a planar level so color perception is usually such a minor factor that it can generally be ignored. The most important factor with quality of image resizing is how well the algorithm antialises the results (avoids "jaggies") without excessively softening or otherwise distorting the image.

And of course, this topic has nothing to do with TIFF.

Bob
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Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen