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1994.09.16 07:17 "Question About Separated TIFF Images", by John M Davison
1994.09.16 17:58 "Re: Question About Separated TIFF Images", by Sam Leffler

1994.09.16 07:17 "Question About Separated TIFF Images", by John M Davison

Page 69 of the TIFF 6.0 Specification says that "In a separated image, each pixel consists of N components. Each component represents the amount of a particular ink that is to be used to represent the image at that location..." Does this mean that there can be no extra samples in a separated image?

Further down on the page, the Specification says "BitsPerSample = 8,8,8,8 (for CMYK). SHORT. For now, only 8-bit components are recommended. The value "8" is repeated SamplesPerPixel times." This raises the following questions:

  1. "BitsPerSample = 8,8,8,8 (for CMYK)". Does this mean that CMYK images cannot have extra samples? What about non-CMYK separated images?
  2. "For now, only 8-bit components are recommended." Does this mean that extra samples must be confined to 8 bits too?
  3. "For now, only 8-bit components are recommended." Are there any cases in which 8-bit components are recommended but not required? Must extra samples (assuming one can have them) be confined to 8 bits too?

--
John Davison
Electronic Mail: davisonj@ecn.purdue.edu
WWW Home Page: <http://en.ecn.purdue.edu:20002/~davisonj/HomePage.html>