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April 2005
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2005.04.26 18:27 "Re: TIFF Technote 3, draft 2", by Chris Cox
> To make floating point a more meaningful format within the tiff spec, it > would be nice to shift away from the simple 0.0 -> 1.0 mapping approach to > a real world scene reference. Again, it is not a requirement, just a suggestion to make previews more efficient (so the preview application/OS does not have to know about toning algorithms to get a reasonable representation of the image). > Most floating point data have some kind of reference to what 1.0 means, or > simply expect the data representing some physical unit (cd/sqr meter or > the like). The stonits tag make sense with unconverted XYZ data, while XYZ > data are not covered directly by the current tiff spec. You can store XYZ as an RGB image, with an XYZ ICC profile attached (takes less than 100 bytes). Chris