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TIFF Tag YCbCrPositioning

IFDImage
Code531 (hex 0x0213)
NameYCbCrPositioning
LibTiff nameTIFFTAG_YCBCRPOSITIONING
TypeSHORT
Count1
Default1 (centered)

Description

Specifies the positioning of subsampled chrominance components relative to luminance samples.

The specification defines these values:

1 = centered
2 = cosited

LibTiff defines these values:

YCBCRPOSITION_CENTERED = 1;
YCBCRPOSITION_COSITED = 2;

Field value 1 (centered) must be specified for compatibility with industry standards such as PostScript Level 2 and QuickTime. Field value 2 (cosited) must be specified for compatibility with most digital video standards, such as CCIR Recommendation 601-1.

The TIFF-F specification (RFC 2301) renames this tag to 'ChromaPositioning' to reflect extended applicability to other color spaces.

Related tags

YCbCrCoefficients
YCbCrSubSampling

See also

TIFF Specification, revision 6.0, page 92
RFC 2301 - File Format for Internet Fax