TIFF 6.0 Specification
Final—June 3, 1992
this array may not always be equal, for example: 5/6/5 16-bit pixels.
BitsPerSample should be interpreted as the BitsPerSample value associated with a
particular component. In the case of unequal BitsPerSample values, the defini-
tions below can be extended in a straightforward manner.
This section has the following differences with Appendix H in TIFF 5.0:
• removed the use of image colorimetry defaults
• renamed the ColorResponseCurves field as TransferFunction
• optionally allowed a single TransferFunction table to describe all three chan-
nels
• described the use of the TransferFunction field for YCbCr, Palette,
WhiteIsZero and BlackIsZero PhotometricInterpretation types
• added the TransferRange tag to expand the range of the TransferFunction
below black and above white
• added the ReferenceBlackWhite field
• addressed the issue of color appearance
Colorimetry Field Definitions
WhitePoint
Tag
= 318 (13E.H)
Type = RATIONAL
N
=2
The chromaticity of the white point of the image. This is the chromaticity when
each of the primaries has its ReferenceWhite value. The value is described using
the 1931 CIE xy chromaticity diagram and only the chromaticity is specified.
This value can correspond to the chromaticity of the alignment white of a monitor,
the filter set and light source combination of a scanner or the imaging model of a
rendering package. The ordering is white[x], white[y].
For example, the CIE Standard Illuminant D65 used by CCIR Recommendation
709 and Kodak PhotoYCC is:
3127/10000,3290/10000
No default.
PrimaryChromaticities
Tag
=319 (13F.H)
Type = RATIONAL
N
=6
83