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A lightweight, fast implementation of DEC SIXEL graphics codec
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README.md

libsixel

Build Status Coverage Status

What is this?

This package provides encoder/decoder implementation for DEC SIXEL graphics, and some converter programs.

img2sixel

SIXEL is one of image formats for printer and terminal imaging introduced by Digital Equipment Corp. (DEC). Its data scheme is represented as a terminal-friendly escape sequence. So if you want to view a SIXEL image file, all you have to do is "cat" it to your terminal.

SIXEL Animation

img2sixel(1) can decode GIF animation.

Animation

Related projects

Video streaming

Now Youtube video streaming is available over SIXEL protocol by FFmpeg-SIXEL project.

FFmpeg-SIXEL

SDL integration: Gaming, Virtualization, ...etc.

SDL1.2-SIXEL project makes enable you to operate various GUI applications on the terminal.

You can play "The Battle for Wesnoth" over SIXEL protocol.

SDL1.2-SIXEL WESNOTH

You can run QEMU on SIXEL terminals.

SDL1.2-SIXEL QEMU

SDL1.2-SIXEL can collaborate with XSDL-SIXEL.

SDL1.2-SIXEL XSDL

X11 on SIXEL terminals

XSIXEL is a kdrive server implementation for SIXEL terminals.

XSIXEL

W3M integration

img2sixel(1) can be integrated with Arakiken's w3m fork(remoteimg branch).

w3m-sixel

@uobikiemukot's sdump project selected another approach. He wrote a w3mimgdisplay compatible program yaimg-sixel. It also works with ranger.

w3m-yaimg-sixel

GNU Screen integration

Arakiken's GNU Screen fork(sixel branch) works with SIXEL-supported applications including above products. This project is now in progress. GUI flavored SIXEL applications will integrated with existing terminal applications on it.

w3m-sixel-screen

sixel-screen

xsixel-screen

See also on youtube.

Twitter client integration

Some NetBSD/OpenBSD users are doing amazing challenges.

arakiken's mikutterm(mikutterm-sixel)

Now mikutter + mikutterm works with libsixel inline-image extension.

SIXEL works with old powerless machines such as

NetBSD/luna68k (here is OMRON LUNA-II):

mikutterm-netbsd-luna68k

NetBSD/hp300 (here is HP9000/425e):

mikutterm-netbsd-hp9000

arakiken's tw(tw-sixel)

arakiken's tw(tw-sixel) works with libsixel inline-image extension.

SIXEL works with old powerless machines such as OpenBSD/luna88k (here is OMRON LUNA-88K2 MC88100@33MHz):

mikutterm-netbsd-hp9000

sayaka-chan

sayaka-chan works with libsixel inline-image extension.

SIXEL works with old powerless machines such as NetBSD/x68k (here is SHARP X68030 with 060turbo):

sayaka-chan

SIXEL works even in-kernel console. @isaki68k wrote a patch for ite(4).

ite(4)

Highlighted features

Improved compression

Former sixel encoders(such as ppmtosixel) are mainly designed for dot-matrix printers. They minimize the amount of printer-head movement distance. But nowadays this method did not represent the best performance for displaying sixel data on terminal emulators. SIXEL data for terminals were found in 80's Usenet, but the technology of how to create them seems to be lost. kmiya's sixel introduces the encoding method which is re-designed for terminal emulators to optimize the overhead of transporting SIXEL with keeping compatibility with former SIXEL terminal. Now libsixel and ImageMagick's sixel coder follow it.

@arakiken, known as the maintainer of mlterm, describes about the way to generate high quality SIXEL, which is adopted by libsixel (http://mlterm.sourceforge.net/libsixel.pdf, in Japanese).

High quality quantization

img2sixel(1) supports color image quantization. It works well even if few number of colors are allowed.

  • ppmtosixel (netpbm)

    $ jpegtopnm images/snake.jpg | pnmquant 16 | ppmtosixel

    ppmtosixel

  • ppmtosixel with Floyd–Steinberg dithering (netpbm)

    $ jpegtopnm images/snake.jpg | pnmquant 16 -floyd | ppmtosixel

    ppmtosixel

  • kmiya's sixel

    $ sixel -p16 images/snake.jpg

    kmiya's sixel

  • PySixel (sixelconv command)

    $ sixelconv -n16 images/snake.jpg

    PySixel

  • libsixel (img2sixel command)

    $ img2sixel -p16 images/snake.jpg

    PySixel

Terminal requirements

If you want to view a SIXEL image, you have to get a terminal which support sixel graphics.

Now SIXEL feature is supported by the following terminals.

Install

Using package managers

You can install libsixel via the following package systems.

Build from source package

$ ./configure
$ make
# make install

Build with optional packages

You can configure with the following options

--with-libcurl            build with libcurl (default: auto)
--with-gd                 build with libgd (default: no)
--with-gdk-pixbuf2        build with gdk-pixbuf2 (default: no)
--with-jpeg               build with libjpeg (default: auto)
--with-png                build with libpng (default: auto)
--with-pkgconfigdir       specify pkgconfig dir (default is libdir/pkgconfig)
--with-bashcompletiondir  specify bashcompletion.d
--with-zshcompletiondir   specify zshcompletion.d

For more information, see "./configure --help".

Cross compiling with MinGW

You can build a windows binary in cross-build environment.

$ CC=i686-w64-mingw32-gcc cross_compile=yes ./configure --host=i686-w64-mingw32
$ make

Usage of command line tools

img2sixel

Usage: img2sixel [Options] imagefiles
       img2sixel [Options] < imagefile

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 -p option (color reduction)
                           DIFFUSIONTYPE is one of them:
                             auto     -> choose diffusion type
                                         automatically (default)
                             none     -> do not diffuse
                             fs       -> Floyd-Steinberg method
                             atkinson -> Bill Atkinson's 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 filter 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.
                             auto -> decide quality mode
                                     automatically (default)
                             low  -> low quality and high
                                     speed mode
                             high -> high quality and low
                                     speed mode
                             full -> full quality and careful
                                     speed mode
-l LOOPMODE, --loop-control=LOOPMODE
                           select loop control mode for GIF
                           animation.
                             auto    -> honor 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                 show this help

Convert a jpeg image file into a sixel file

$ img2sixel < images/egret.jpg > egret.sixel

Reduce colors to 16:

$ img2sixel -p 16 < images/egret.jpg > egret.sixel

Reduce colors with fixed palette:

$ img2sixel -m images/map16.png < images/egret.jpg > egret.sixel

sixel2png

Usage: sixel2png -i input.sixel -o output.png
       sixel2png < input.sixel > output.png

Options:
-i, --input     specify input file
-o, --output    specify output file
-V, --version   show version and license information
-H, --help      show this help

Convert a sixel file into a png image file

$ sixel2png < egret.sixel > egret.png

Usage of conversion API 1.3

The Whole API is described here.

Example

If you use OSX, a tiny example is available here.

opengl example

Bitmap to SIXEL

sixel_encode function converts bitmap array into SIXEL format.

/* converter API */

/* convert pixels into sixel format and write it to output context */
int
sixel_encode(
    unsigned char  /* in */ *pixels,     /* pixel bytes */
    int            /* in */  width,      /* image width */
    int            /* in */  height,     /* image height */
    int            /* in */  depth,      /* color depth: now unused */
    sixel_dither_t /* in */ *dither,     /* dither context */
    sixel_output_t /* in */ *context);   /* output context */

To use this function, you have to initialize two objects,

  • sixel_dither_t (dithering context object)
  • sixel_output_t (output context object)

Dithering context

Here is a part of APIs for dithering context manipulation.

/* create dither context object */
sixel_dither_t *
sixel_dither_create(int /* in */ ncolors); /* number of colors */

/* get built-in dither context object */
sixel_dither_t *
sixel_dither_get(int builtin_dither); /* ID of built-in dither object */

/* increment reference count of dither context object (thread-unsafe) */
void
sixel_dither_ref(sixel_dither_t *dither); /* dither context object */

/* decrement reference count of dither context object (thread-unsafe) */
void
sixel_dither_unref(sixel_dither_t *dither); /* dither context object */

/* initialize internal palette from specified pixel buffer */
int
sixel_dither_initialize(
    sixel_dither_t *dither,          /* dither context object */
    unsigned char /* in */ *data,    /* sample image */
    int /* in */ width,              /* image width */
    int /* in */ height,             /* image height */
    int /* in */ pixelformat,        /* one of enum pixelFormat */
    int /* in */ method_for_largest, /* method for finding the largest dimension */
    int /* in */ method_for_rep,     /* method for choosing a color from the box */
    int /* in */ quality_mode);      /* quality of histogram processing */

Output context

Here is a part of APIs for output context manipulation.

typedef int (* sixel_write_function)(char *data, int size, void *priv);

/* create output context object */
sixel_output_t *const
sixel_output_create(
    sixel_write_function /* in */ fn_write, /* callback function for output sixel */
    void /* in */ *priv                     /* private data given as
);                                             3rd argument of fn_write */

/* increment reference count of output context object (thread-unsafe) */
void
sixel_output_ref(sixel_output_t /* in */ *output);     /* output context */

/* decrement reference count of output context object (thread-unsafe) */
void
sixel_output_unref(sixel_output_t /* in */ *output);   /* output context */

SIXEL to indexed bitmap

sixel_decode function converts SIXEL into indexed bitmap bytes with its palette.

/* malloc(3) compatible function */
typedef void * (* sixel_allocator_function)(size_t size);

/* convert sixel data into indexed pixel bytes and palette data */
int
sixel_decode(unsigned char              /* in */  *sixels,    /* sixel bytes */
             int                        /* in */  size,       /* size of sixel bytes */
             unsigned char              /* out */ **pixels,   /* decoded pixels */
             int                        /* out */ *pwidth,    /* image width */
             int                        /* out */ *pheight,   /* image height */
             unsigned char              /* out */ **palette,  /* RGBA palette */
             int                        /* out */ *ncolors,   /* palette size (<= 256) */
             sixel_allocator_function   /* out */ allocator); /* malloc function */

Support

This software is provided "as is" without express or implied warranty. The main support channel for this software is the github issue tracker:

https://github.com/saitoha/libsixel/issues

Please post your issue if you have any problems, questions or suggestions.

License

The MIT License (MIT)

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.

Contributers and Reviewers

  • @arakiken
  • @elfring
  • @isaki68k
  • @knok
  • @mattn
  • @msmhrt
  • @obache
  • @tsutsui
  • @ttdoda
  • @uobikiemukot
  • @vrtsds
  • @waywardmonkeys
  • @yoshikaw

Acknowledgment

This software derives from the following implementations.

sixel 2014-3-2

src/tosixel.c, src/fromsixel.c, and some part of converters/loader.c are derived from kmiya's "sixel" original version (2014-3-2)

Package: http://nanno.dip.jp/softlib/man/rlogin/sixel.tar.gz

Unofficial repo: https://github.com/saitoha/sixel

This work is written by kmiya@ culti. He distributes it under very permissive license.

The original license text(in Japanese only) is:

このプログラム及びソースコードの使用について個人・商用を問わず

ご自由に使用していただいで結構です。

また、配布・転載・紹介もご連絡の必要もありません。

ソースの改変による配布も自由ですが、どのバージョンの改変かを

明記されることを希望します。

バージョン情報が無い場合は、配布物の年月日を明記されることを

希望します。

                  2014/10/05  kmiya

The unofficial translation:

Anyone is free to use this program for any purpose,
commercial or non-commercial, without any restriction.

Anyone is free to distribute, copy, publish, or
advertise this software, without any contact.

Anyone is free to distribute with modification of the
source code, but I "hope" that its based version or
date will be written clearly.

                                    2014/10/05 kmiya

kmiya also said this is compatible with MIT/BSD/GPL.

stbi-1.41

This software includes stbi-1.41 (stb_image.h), public domain JPEG/PNG reader.

https://github.com/nothings/stb

stbiw-0.92

This software includes stbiw-0.94 (stb_image_write.h), public domain PNG/BMP/TGA writer.

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 written 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.

loader.h (@uobikiemukot's sdump)

Some parts of converters/loader.c are imported from @uobikiemukot's sdump project

The MIT License (MIT)

Copyright (c) 2014 haru

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.

ax_gcc_var_attribute / ax_gcc_func_attribute

These are useful m4 macros for detecting some GCC attributes.

http://www.gnu.org/software/autoconf-archive/ax_gcc_var_attribute.html http://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html

Copyright (c) 2013 Gabriele Svelto gabriele.svelto@gmail.com

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty.

graphics.c (from Xterm pl#310)

The helper function hls2rgb in src/fromsixel.c is imported from graphics.c in Xterm pl#310, originally written by Ross Combs.

Copyright 2013,2014 by Ross Combs

                    All Rights Reserved

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 ABOVE LISTED COPYRIGHT HOLDER(S) 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.

Except as contained in this notice, the name(s) of the above copyright holders shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization.

test images

http://public-domain-photos.com/

The following test images in "image/" directory came from PUBLIC-DOMAIN-PHOTOS.com.

These are in the public domain.

vimperator3.png (mascot of vimperator)

images/vimperator3.png is in the public domain.

author: @k_wizard
url: http://quadrantem.com/~k_wizard/vimprtan/

References

ImageMagick

We are greatly inspired by the quality of ImageMagick and added some resampling filters to img2sixel in reference to the line-up of filters of MagickCore's resize.c.

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

Similar software

  • netpbm

    You can get SIXEL graphics using ppmtosixel or pbmtoln03.

  • kmiya's sixel

    libgd based SIXEL converter

  • PySixel

    Python implementation of SIXEL converter

  • ImageMagick

    Now SIXEL coder is available in svn trunk and V6 branch.

  • monosixel in arakiken's tw

    A monochrome SIXEL converter

  • xpr(x11-apps)

    xpr(1) can convert a xwd(X window dump) format image into a sixel image with '-device ln03' or '-device la100' option. But now it is not maintained. It looks broken.

Other software supporting SIXEL

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