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Man Pages


Manual Reference Pages  -  IMG2SIXEL (1)

NAME

img2sixel - image converter to DEC SIXEL graphics

CONTENTS

Synopsis
Description
Authors
Copyright
Thanks
References
Contributors
Bugs

SYNOPSIS

img2sixel [ -options ] imagefiles
img2sixel [ -options ] < imagefiles

DESCRIPTION

img2sixel convert JPEG/PNG images into DEC SIXEL image format.

COMMAND-LINE OPTIONS

img2sixel has the following command-line options:
-7, --7bit-mode
  generate a sixel image for 7bit terminals or printers (default).
-8, --8bit-mode
  generate a sixel image for 8bit terminals or printers.
-p COLORS, --colors=COLORS
  specify number of colors to reduce the image to (default=256).
-m FILE, --mapfile=FILE
  transform image colors to match this set of colorsspecify map.
-e, --monochrome
  output monochrome sixel image. this option assumes the terminal background color is black.
-i, --invert
  assume the terminal background color is white. make sense only when -e option is given.
-I, --high-color
  output 15bpp sixel image
-u, --use-macro
  use DECDMAC and DEVINVM sequences to optimize GIF animation rendering.
-n MACRONO, --macro-number=MACRONO
  specify an number argument for DECDMAC and make terminal memorize SIXEL image. No image is shown if this option is specified
-C COMPLEXIONSCORE, --complexion-score=COMPLEXIONSCORE
  specify an number argument for the score of complexion correction. COMPLEXIONSCORE must be 1 or more.
-g, --ignore-delay
  render GIF animation without delay.
-S, --static
  render animated GIF as a static image.
-d DIFFUSIONTYPE, --diffusion=DIFFUSIONTYPE
  choose diffusion method which used with color reduction.
DIFFUSIONTYPE is one of them:
auto -> choose diffusion type automatically (default)
none -> do not diffusion
fs -> Bill Atkinson’s method
atkinson -> Floyd-Steinberg method
jajuni -> Jarvis, Judice & Ninke
stucki -> Stucki’s method
burkes -> Burkes’ method
-f FINDTYPE, --find-largest=FINDTYPE
  choose method for finding the largest dimension of median cut boxes for splitting, make sense only when -p option (color reduction) is specified.
FINDTYPE is one of them:
auto -> choose finding method automatically (default)
norm -> simply comparing the range in RGB space
lum -> transforming into luminosities before the comparison
-s SELECTTYPE, --select-color=SELECTTYPE
  choose the method for selecting representative color from each median-cut box, make sense only when -p option (color reduction) is specified.
SELECTTYPE is one of them:
auto -> choose selecting method automatically (default)
center -> choose the center of the box
average -> calculate the color average into the box
histogram -> similar with average but considers color histogram
-c REGION, --crop=REGION
  crop source image to fit the specified geometry.
REGION should be formatted as ’%dx%d+%d+%d’.
-w WIDTH, --width=WIDTH
  resize image to specified width.
WIDTH is represented by the following syntax:
auto -> preserving aspect ratio (default)
<number>% -> scale width with given percentage
<number> -> scale width with pixel counts
<number>px -> scale width with pixel counts
-h HEIGHT, --height=HEIGHT
  resize image to specified height.
HEIGHT is represented by the following syntax
auto -> preserving aspect ratio (default)
<number>% -> scale height with given percentage
<number> -> scale height with pixel counts
<number>px -> scale height with pixel counts
-r RESAMPLINGTYPE, --resampling=RESAMPLINGTYPE
  choose resampling method used with -w or -h option (scaling).
RESAMPLINGTYPE is one of them:
nearest -> Nearest-Neighbor method
gaussian -> Gaussian filter
hanning -> Hanning filter
hamming -> Hamming filter
bilinear -> Bilinear filter (default)
welsh -> Welsh filter
bicubic -> Bicubic filter
lanczos2 -> Lanczos-2 filter
lanczos3 -> Lanczos-3 filter
lanczos4 -> Lanczos-4 filter
-q QUALITYMODE, --quality=QUALITYMODE
  select quality of color quanlization.
QUALITYMODE is one of them:
auto -> decide quality mode automatically (default)
high -> high quality and low speed mode
low -> low quality and high speed mode
full -> quality and careful speed mode
-l LOOPMODE, --loop-control=LOOPMODE
  select loop control mode for GIF animation.
auto -> honer the setting of GIF header (default)
force -> always enable loop
disable -> always disable loop
-t PALETTETYPE, --palette-type=PALETTETYPE
  select palette color space type.
auto -> choose palette type automatically (default)
hls -> use HLS color space
rgb -> use RGB color space
-b BUILTINPALETTE, --builtin-palette=BUILTINPALETTE
  select built-in palette type
xterm16 -> X default 16 color map
xterm256 -> X default 256 color map
vt340mono -> VT340 monochrome map
vt340color -> VT340 color map
-E ENCODEPOLICY, --encode-policy=ENCODEPOLICY
  select encoding policy
auto -> choose encoding policy automatically (default)
fast -> encode as fast as possible
size -> encode to as small sixel sequence as possible
-P, --penetrate
  penetrate GNU Screen using DCS pass-through sequence.
-D, --pipe-mode
  read source images from stdin continuously.
-v, --verbose
  show debugging info.
-V, --version
  show version and license info.
-H, --help
  print help.

SEE ALSO

sixel(5) sixel2png(1)

AUTHORS

img2sixel is maintained by Hayaki Saito. We imported whole code of stbi-1.41, written by Sean Barrett and its contributers, for loading PNG/JPEG images, and imported some code from pnmquant.c (netpbm library) for image quantization.

COPYRIGHT

Copyright (c) 2014 Hayaki Saito

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

THANKS

This software derives from the following implementations.
stbi-1.41
  This software includes stbi-1.41 (stb_image.h), a public domain JPEG/PNG reader.
https://github.com/nothings/stb

pnmquant.c (netpbm library)
  The implementation of median cut algorithm for color quantization in quant.c is imported from pnmcolormap included in netpbm library.
http://netpbm.sourceforge.net/
pnmcolormap was derived from ppmquant, originally by Jef Poskanzer.

Copyright (C) 1989, 1991 by Jef Poskanzer.
Copyright (C) 2001 by Bryan Henderson.
Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. This software is provided "as is" without express or implied warranty.

monosixel (arakiken’s tw)
 

The pattern dither algorithm implemented in quant.c is imported from monosixel/main.c in arakiken’s tw "sixel" branch.
https://bitbucket.org/arakiken/tw/branch/sixel
This tool is written by Araki Ken, and we regard it as a derivative of. original tw, created by Sho Hashimoto.

Copyright (c) 2012 Sho Hashimoto
Copyright (c) 2014 Araki Ken
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

sixel 2014-3-2
 

some part of converters/loader.c are derived from kmiya’s "sixel" original version (2014-3-2).
http://nanno.dip.jp/softlib/man/rlogin/sixel.tar.gz
It is written by kmiya@culti.
He distributes it under very permissive license which permits useing, copying, modification, redistribution, and all other public activities without any restrictions.
He declares this is compatible with MIT/BSD/GPL.

REFERENCES

resize.c (ImageMagick)
 

We added some resampling filters in reference to the line-up of filters of MagickCore’s resize.c.

http://www.imagemagick.org/api/MagickCore/resize_8c_source.html

CONTRIBUTORS

Araki Ken (@arakiken),
Iwamoto Kouichi (@ttdoda)
Kazuhiro YOSHIKAWA (@yoshikaw)

BUGS

o Send bug-reports, fixes, enhancements to user@zuse.jp.

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