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February 2004
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2004.02.24 19:14 "Re: Support for 16-bits per sample images", by Chris Cox
At 9:54 AM -0600 2/24/04, Bob Friesenhahn wrote: > On Tue, 24 Feb 2004 mayankg@iiitb.ac.in wrote: > > Hi, > > Does the libtiff library supports 16-bits per sample images for both RGB and > > CMYK images? > > If Yes, then what is the latest version that supports it? > > > > Also, I found that, the version that i have, does have some level of support > > for 16-bit RGB images, but it just truncates the data from 16-bits > > to 8-bits to > > store it as an 8-bit image. Is this statement correct? > > What the other guys have told you on this list is that libtiff is > capable of producing the original 16-bit data, but the interfaces > require that you parse the data in your own application. Care must be > taken since 16-bit TIFF can be big or little endian and the data is > not re-ordered for you. If that is the case, that would be a major bug in LibTIFF -- because differencing predictors have to be applied/removed in native byte order. LibTIFF should always convert the image data to native byte order before handing it off. Chris