From 9491825ddff7a294d1f49061bae7044e426aeb2e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Fri, 6 Nov 2015 05:38:49 +0100 Subject: Imported Upstream version 1.8.3 --- tiff/html/man/tiffdither.1.html | 196 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 196 insertions(+) create mode 100755 tiff/html/man/tiffdither.1.html (limited to 'tiff/html/man/tiffdither.1.html') diff --git a/tiff/html/man/tiffdither.1.html b/tiff/html/man/tiffdither.1.html new file mode 100755 index 0000000..1945c5b --- /dev/null +++ b/tiff/html/man/tiffdither.1.html @@ -0,0 +1,196 @@ + + + + + + +TIFFDITHER + + + +

TIFFDITHER

+NAME
+SYNOPSIS
+DESCRIPTION
+OPTIONS
+NOTES
+SEE ALSO
+ +

+ +

NAME

+ + + + + +

tiffdither − convert a greyscale image to bilevel +using dithering

+ +

SYNOPSIS

+ + + + + +

tiffdither [ options ] input.tif +output.tif

+ +

DESCRIPTION

+ + + + + +

tiffdither converts a single channel 8-bit +greyscale image to a bilevel image using Floyd-Steinberg +error propagation with thresholding.

+ +

OPTIONS

+ + + + + + + + +

+ +

−c

+ +

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, and g4 +for CCITT Group 4 (T.6) compression. By default +tiffdither will compress data according to the value +of the Compression tag found in the source file.

+ + + + + +

The CCITT Group 3 and Group 4 compression +algorithms can only be used with bilevel data.

+ +

Group 3 compression can be specified together with +several T.4-specific options: 1d for 1-dimensional +encoding, 2d for 2-dimensional encoding, and +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 predictor value. 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.

+ + + + + + + + + + + + + + + + + + + + +

+ + −f +	+ + Specify the bit fill order to use in writing output +data. By default, tiffdither will create a new file +with the same fill order as the original. Specifying +−f lsb2msb will force data to be written with +the FillOrder tag set to LSB2MSB , +while −f msb2lsb will force data to be written +with the Fill- Order tag set to MSB2LSB +. +	+
+ + −r +	+ + Make each strip have no more than the given number of rows. +	+
+ + −t +	+ + Set the threshold value for dithering. By default the +threshold value is 128. +	+

+ +

NOTES

+ + + + + +

The dither algorithm is taken from the +tiffmedian(1) program (written by Paul Heckbert).

+ +