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2007.07.04 18:59 "Re: 16-Bit-Per-Channel Lossless Compression", by Bob Friesenhahn
On Wed, 4 Jul 2007, Joris wrote: > > Thing is, for photographic data the only real compression that works and make > sense both, is lossy compression, is JPEG. Therefore, part of the answer to > this problem ought to be more widespread and easier building of a > 12bit/channel JPEG compression. > > That's doesn't cover the really lossy needs (though on photographic data > there is not much such need), and it doesn't cover the really 16bit/channel > need, so it's only part of the answer. But a vital part nonetheless. Your 12bit/channel is sufficient to represent what today's high-end image sensors are able to accomplish in the typical ambient environment. The popularity of 16/bit/channel is primarily due to the way the samples nicely fit a native CPU data type so they may be handled quickly with the minimum of code. HDR, linear-light, and exotic scientific/sensing applications may need many more bits. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/