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devel-docs: add info about "precision" field in XCF header.

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Jehan
2018-05-18 04:33:00 +02:00
parent cdfb7fdddd
commit 7bad32cf33
1 changed files with 38 additions and 0 deletions
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38
devel-docs/xcf.txt
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@ -642,6 +642,44 @@ The image structure always starts at offset 0 in the XCF file.
2: Indexed color 2: Indexed color
(see enum GimpImageBaseType (see enum GimpImageBaseType
in libgimpbase/gimpbaseenums.h) in libgimpbase/gimpbaseenums.h)
uint32 precision Image precision; this field is only present for
XCF 4 or over (since GIMP 2.10.0). Its value for
XCF 7 or over is one of:
100: 8-bit linear integer
150: 8-bit gamma integer
200: 16-bit linear integer
250: 16-bit gamma integer
300: 32-bit linear integer
350: 32-bit gamma integer
500: 16-bit linear floating point
550: 16-bit gamma floating point
600: 32-bit linear floating point
650: 32-bit gamma floating point
700: 64-bit linear floating point
750: 64-bit gamma floating point
For XCF 4 (which was a development version, hence
this format should not be found often and may be
ignored by readers), its value may be one of:
0: 8-bit gamma integer
1: 16-bit gamma integer
2: 32-bit linear integer
3: 16-bit linear floating point
4: 32-bit linear floating point
For XCF 5 or 6 (which were development versions,
hence these formats may be ignored by readers),
its value may be one of:
100: 8-bit linear integer
150: 8-bit gamma integer
200: 16-bit linear integer
250: 16-bit gamma integer
300: 32-bit linear integer
350: 32-bit gamma integer
400: 16-bit linear floating point
450: 16-bit gamma floating point
500: 32-bit linear floating point
550: 32-bit gamma floating point
NOTE: XCF 3 or older's precision was always
"8-bit gamma integer".
property-list Image properties property-list Image properties
,----------------- Repeat once for each layer, topmost layer first: ,----------------- Repeat once for each layer, topmost layer first:
| uint32 lptr Pointer to the layer structure | uint32 lptr Pointer to the layer structure