Ppmtoterm User Manual(1) General Commands Manual Ppmtoterm User Manual(1)
NAME
ppmtoterm - convert a PPM image to a ANSI ISO 6429 ascii image
SYNOPSIS
ppmtoterm
[ppmfile]
All options can be abbreviated to their shortest unique prefix. You may
use two hyphens instead of one. You may separate an option name and its
value with white space instead of an equals sign.
DESCRIPTION
This program is part of Netpbm(1).
This program tries to produce an accurate representation of a PPM image
on an terminal that implements the ANSI ISO 6429 standard. It approxi-
mates colors, finding the minimum Cartesian distance between the input
RGB vectors and the ones in the generated palette. As the available
color palette is somewhat restricted, you get the best results when the
colors in the original image are few and the RGB intensities are close
to zero, half of maximum, and maximum.
You can usually get good results with cartoons or images with plain col-
ors (no gradients). With photos, results can vary, but are usually not
very accurate.
The output image has one line for each row and one character for each
column of the input image. E.g. an 80 pixel by 25 pixel PPM image would
fill up an 80x25 terminal screen. Use pamscale or pamcut to make your
image fit properly on your screen.
Furthermore, use pamscale to recover the proper aspect ratio, because a
character on a terminal screen is rarely square. Typically, a character
is twice has high as it is wide, so in order for a 20x20 image to appear
square on your terminal, as it should, you'll want to squash it verti-
cally or stretch it horizontally by a factor of two (resulting int 10x20
characters are 20x40 characters).
The image starts at the current cursor position on the terminal screen.
Each successive row starts at Column 0 on the screen. If you want to
shift the image up or down, for example to center it, use pnmpad on the
input.
This program was born with the objective of displaying nice color images
on the Linux console, e.g. a proper logo at Linux boot.
ppmtoascii does a similar things, but combines 2 or 8 pixels into one
character, where the character roughly represents those particular pix-
els, whereas ppmtoterm displays each character of the image as a single
pixel.
pbmto4425 does a similar thing for black and white images, using line
drawing characters, on some terminals.
OPTIONS
There are no command line options defined specifically for ppmtoterm,
but it recognizes the options common to all programs based on libnetpbm
(See ]8;;index.html#commonoptions\ Common Options]8;;\ .)
SEE ALSO
pamscale(1), pamcut(1), ppmtoascii(1), pbmtoascii(1), pbmto4425(1),
ppm(1)
AUTHOR
Copyright (C) 2002 by Ero Carrera.
HISTORY
This program was new in Netpbm 10.9 (August 2002).
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/ppmtoterm.html
netpbm documentation 17 June 2017 Ppmtoterm User Manual(1)
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