GIMPPRINT-IMAGETYPES(7) Gimp-Print Manual Pages GIMPPRINT-IMAGETYPES(7)NAME
gimpprint-imagetypes - Gimp-Print image types
DESCRIPTION
Gimp-Print includes several image types which can be used to optimise the dither, depending on the type of image you wish to print.
IMAGE TYPE
Possible values are:
Value Description
-------------------------------------------------
1 Line art (color or gray scale)
2 Primarily solid colors or smooth gradi-
ents (color or gray scale)
3 Continuous-tone photographs (color or
gray scale)
Option 0 is the fastest. It generates strong, but not particularly accurate, colors. There may be some fairly sharp color transitions in
this mode.
Option 1 generates more accurate colors, but is slower.
Option 2 generates the most accurate colors, but is considerably slower.
Note that any of the modes may be used with either color or black & white output. If black and white output is requested, but a color mode
used, composite color will be printed. This generally offers smoother tone, but less purity of gray or black, than pure black ink. Fur-
thermore, it is possible to tune the color of the gray (to achieve warmer or cooler effects) using the color controls in this fashion.
COPYRIGHT
Copyright (C) 2001 Michael Sweet (mike@easysw.com) and Robert Krawitz (rlk@alum.mit.edu)
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This manual page was written by Roger Leigh (roger@whinlatter.uklinux.net)
SEE ALSO gimpprint-color(7), gimpprint-dithers(7), gimpprint-inktypes(7), gimpprint-mediasizes(7), gimpprint-mediasources(7), gimpprint-medi-
atypes(7), gimpprint-models(7), gimpprint-resolutions(7).
Version 4.2.4 25 Nov 2002 GIMPPRINT-IMAGETYPES(7)
Check Out this Related Man Page
pgmtoppm(1) General Commands Manual pgmtoppm(1)NAME
pgmtoppm - colorize a PGM (grayscale) image into a PGM (color) image
SYNOPSIS
pgmtoppm colorspec [pgmfile]
pgmtoppm colorspec1-colorspec2 [pgmfile]
pgmtoppm -map mapfile [pgmfile]
DESCRIPTION
Reads a PGM as input. Produces a PPM file as output with a specific color assigned to each gray value in the input.
If you specify one color argument, black in the pgm file stays black and white in the pgm file turns into the specified color in the ppm
file. Gray values in between are linearly mapped to differing intensities of the specified color.
If you specify two color arguments (separated by a dash), then black gets mapped to the first color and white gets mapped to the second and
gray values in between get mapped linearly (across a three dimensional space) to colors in between.
You can specify the color in one of five ways:
o A name, from an X11-style color names file.
o An X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are each 1- to 4-digit hexadecimal numbers.
o An X11-style decimal specifier: rgbi:r/g/b, where r g and b are floating point numbers between 0 and 1.
o For backwards compatibility, an old-X11-style hexadecimal number: #rgb, #rrggbb, #rrrgggbbb, or #rrrrggggbbbb.
o For backwards compatibility, a triplet of numbers separated by commas: r,g,b, where r g and b are floating point numbers between 0
and 1. (This style was added before MIT came up with the similar rgbi style.)
Also, you can specify an entire colormap with the -map option. The mapfile is just a ppm file; it can be any shape, all that matters is
the colors in it and their order. In this case, black gets mapped into the first color in the map file, and white gets mapped to the last
and gray values in between are mapped linearly onto the sequence of colors in between.
NOTE - MAXVAL
The "maxval," or depth, of the output image is the same as that of the input image. The maxval affects the color resolution, which may
cause quantization errors you don't anticipate in your output. For example, you have a simple black and white image (in fact, let's say
it's a PBM file, since pgmtoppm, like all Netpbm programs, can accept a PBM file as if it were PGM. The maxval of this image is 1, because
only two gray values are needed: black and white. Run this image through pgmtoppm 0f/00/00 to try to make the image black and faint red.
Because the output image will also have maxval 1, there is no such thing as faint red. It has to be either full-on red or black. pgmtoppm
rounds the color 0f/00/00 down to black, and you get an output image that is nothing but black.
The fix is easy: Pass the input through pnmdepth on the way into pgmtoppm to increase its depth to something that would give you the reso-
lution you need to get your desired color. In this case, pnmdepth 16 would do it. Or spare yourself the unnecessary thinking and just say
pnmdepth 255 .
SEE ALSO pnmdepth(1), rgb3toppm(1), ppmtopgm(1), ppmtorgb3(1), ppm(5), pgm(5)AUTHOR
Copyright (C) 1991 by Jef Poskanzer.
24 January 2001 pgmtoppm(1)