Manual Reference Pages - TIFFDITHER (1)
tiffdither - convert a greyscale image to bilevel using dithering
tiffdither converts a single channel 8-bit greyscale image to a bilevel image
using Floyd-Steinberg error propagation with thresholding.
Specify the compression to use for data written to the output file:
none for no compression,
packbits for PackBits compression,
lzw for Lempel-Ziv & Welch compression,
zip for Deflate compression,
g3 for CCITT Group 3 (T.4) compression,
g4 for CCITT Group 4 (T.6) compression.
tiffdither will compress data according to the value of the
Compression tag found in the source file.
CCITT Group 3 and Group 4 compression algorithms can only
be used with bilevel data.
Group 3 compression can be specified together with several
1d for 1-dimensional encoding,
2d for 2-dimensional encoding,
fill to force each encoded scanline to be zero-filled so that the
terminating EOL code lies on a byte boundary.
Group 3-specific options are specified by appending a :-separated
list to the g3 option; e.g.
-c g3:2d:fill to get 2D-encoded data with byte-aligned EOL codes.
LZW compression can be specified together with a
A predictor value of 2 causes
each scanline of the output image to undergo horizontal
differencing before it is encoded; a value
of 1 forces each scanline to be encoded without differencing.
LZW-specific options are specified by appending a :-separated
list to the lzw option; e.g.
-c lzw:2 for
LZW compression with horizontal differencing.
Specify the bit fill order to use in writing output data.
tiffdither will create a new file with the same fill order as the original.
-f lsb2msb will force data to be written with the
Fill Order tag set to
LSB2MSB , while
-f msb2lsb will force data to be written with the
Fill Order tag set to
Make each strip have no more than the given number of rows.
Set the threshold value for dithering.
By default the threshold value is 128.
The dither algorithm is taken from the
program (written by Paul Heckbert).
Libtiff library home page:
|libtiff ||TIFFDITHER (1) ||September 20, 2005 |
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