Make SIXEL color graphics supported by some terminal emulators(DECTerm/RLogin/mlterm/tanasinn/xterm)
Project description
What is SIXEL?
SIXEL is one of image formats for terminal imaging introduced by DEC VT series. SIXEL image data scheme is represented as a terminal-friendly escape sequence. So if you want to show a SIXEL image file, all you have to do is “cat” it to your terminal.
I heared SIXEL is supported by some old terminal applications, such as SAS, WordPerfect.
Nowadays netpbm and Gnuplot support this.
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.
RLogin (Japanese terminal emulator)
tanasinn (Works with firefox)
mlterm
Works on each of X, win32/cygwin, framebuffer version. http://mlterm.sourceforge.net/
XTerm (compiled with –enable-sixel option) You should launch xterm with “-ti 340” option. the SIXEL palette is limited to a maximum of 256 colors. http://invisible-island.net/xterm/
DECterm
Kermit
WRQ Reflection
ZSTEM
Install
via github
$ git clone https://github.com/saitoha/PySixel.git $ cd pysixel $ python setup.py install
or via pip
$ pip install PySixel
Usage
PySixel provides a Command line tool:
$ sixelconv [options] filename
or
$ cat filename | sixelconv [options]
Options:
-h, --help show this help message and exit -8, --8bit-mode Generate a sixel image for 8bit terminal or printer -7, --7bit-mode Generate a sixel image for 7bit terminal or printer -r, --relative-position Treat specified position as relative one -a, --absolute-position Treat specified position as absolute one -x LEFT, --left=LEFT Left position in cell size, or pixel size with unit 'px' -y TOP, --top=TOP Top position in cell size, or pixel size with unit 'px' -w WIDTH, --width=WIDTH Width in cell size, or pixel size with unit 'px' -e HEIGHT, --height=HEIGHT Height in cell size, or pixel size with unit 'px' -t ALPHATHRESHOLD, --alpha-threshold=ALPHATHRESHOLD Alpha threshold for PNG-to-SIXEL image conversion -c, --chromakey Enable auto chroma key processing -n NCOLOR, --ncolor=NCOLOR Specify number of colors
Example
View an image file:
$ sixelconv test.png
Generate sixel file from an image file:
$ sixelconv < test.png > test.six
View generated sixel file:
$ cat test.six
Show sixel in xterm
$ curl ftp://invisible-island.net/xterm/xterm-301.tgz | tar xz $ cd xterm-301 $ ./configure --enable-wide-chars --enable-sixel-graphics --enable-256-color $ make # make install $ xterm -ti vt340 -e 'sixelconv ~/testdir/test.jpg'
Code Example
import sixel writer = sixel.SixelWriter() writer.draw('test.png')
Dependency
Python imageloader module https://pypi.python.org/pypi/imageloader
Reference
Chris_F_Chiesa, 1990 : All About SIXELs ftp://ftp.cs.utk.edu/pub/shuford/terminal/all_about_sixels.txt
Netpbm http://netpbm.sourceforge.net/
It includes ppmtosixel command http://netpbm.sourceforge.net/doc/ppmtosixel.html
vt100.net http://vt100.net/
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