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-C |
This option overrides the default behaviour of
pal2rgb in determining whether or not
colormap entries contain 16-bit or 8-bit values.
By default the colormap is inspected and
if no colormap entry greater than 255 is found,
the colormap is assumed to have only 8-bit values; otherwise
16-bit values (as required by the
TIFF specification) are assumed.
The
-C option can be used to explicitly specify the number of
bits for colormap entries:
-C 8 for 8-bit values,
-C 16 for 16-bit values.
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Options that affect the output file format are:
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-p |
Explicitly select the planar configuration used in organizing
data samples in the output image:
-p contig for samples packed contiguously, and
-p separate for samples stored separately.
By default samples are packed.
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-c |
Use the specific compression algorithm to encoded image data
in the output file:
-c packbits for Macintosh Packbits,
-c lzw for Lempel-Ziv & Welch,
-c zip for Deflate,
-c none for no compression.
If no compression-related option is specified, the input
file’s compression algorithm is used.
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-r |
Explicitly specify the number of rows in each strip of the
output file.
If the
-r option is not specified, a number is selected such that each
output strip has approximately 8 kilobytes of data in it.
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