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NAME
ijsgimpprint - Ghostscript driver for Gimp-Print
SYNOPSIS
gs -sDEVICE=ijs -sIjsServer=/usr/bin/ijsgimpprint -sDeviceManufac-
turer=vendor -sDeviceModel=name [ -dIjsUseOutputFD ] -sIjsParams=[
key1=value1,keyn=valuen... ] [ options ] [ files ]
DESCRIPTION
ijsgimpprint provides Ghostscript with a Gimp-Print driver, supporting
all printers supported by libgimpprint.
IJS is an initiative to improve the quality and ease of use of printing
with Ghostscript. It permits adding or upgrading drivers without
recompiling Ghostscript. An IJS driver runs in a separate process that
communicates with Ghostscript via an IPC channel. The Gimp-Print IJS
driver may be used with AFPL Ghostscript, as it runs in a separate pro-
cess.
The options for this driver are very complex. We strongly recommend
use of a printer management system such as Foomatic rather than config-
uring a spooler manually with this driver. The driver name used by
Foomatic is gimp-print-ijs.
OPTIONS
ijsgimpprint accepts the following options:
Ghostscript IJS options
-dIjsUseOutputFD
This option should be specified whenever output from Ghostscript
will go to stdout or into a pipe. It may be specified in all
other cases, with only a slight performance degradation.
-sIjsParams=Option1=Value1,Option2=Value2
This parameter contains a single string containing a comma-sepa-
rated list of sub-options.
-sDeviceManufacturer=vendor -sDeviceModel=name
This option must be supplied. There is no default. The IJS
driver requires the vendor (it's part of the protocol), but the
ijsgimpprint driver ignores it. It should be CANON, EPSON, LEX-
MARK, or HEWLETT-PACKARD. The value of the -sDeviceModel param-
eter is the same as the value of the -sModel parameter in the
old stp driver.
A complete list of supported printers may be found in gimpprint-
models(7).
Most or all of the Epson Stylus printers are fully functional.
The others vary. In particular, all of the listed Epson Stylus
Photo printers print in full 6-color photo mode; most of the
others do not. The color output has also been better tuned for
Epson Stylus printers than for others.
Gimp-Print IJS options
These options are all used in the -sIjsParams options, except where
mentioned otherwise. Due to their complicated nature, the options are
explained in detail in their own sections.
PRINT RESOLUTION
Quality=quality
The meaning of this is model-specific. Two names are listed for
each resolution; the first (short) name is the quality that must
be passed to Quality, and the second (long) name is descriptive.
Each printer has its own default value; for most printers, this
is a reasonable 300 or 360 DPI resolution. A full list of
available resolutions for each printer may be found in gimp-
print-resolutions(7).
INK TYPES
InkType=inktype
This is printer type specific. The option names are case sensitive. A
full list of available media types may be found in gimmprint-inktypes(7)
.
MEDIA TYPES
MediaType=mediatype
This is printer type specific. The option names are case sensitive. A
full list of available media types may be found in gimpprint-mediatypes(7)
.
MEDIA SOURCES
MediaSource=mediasource
This is printer type specific. The option names are case sensitive. A
full list of available media sources may be found in gimpprint-mediasources(7)
.
MEDIA SIZES
-sPAPERSIZE=papersize
for known Ghostscript paper sizes.
-dDEVICEWIDTHPOINTS=x -dDEVICEHEIGHTPOINTS=y
where x and y are the width and height of the paper respec-
tively, in points (1/72"). Note this is a normal gs option, not
an IJS option.
This is printer-specific; we cannot list the correct values for each
printer here. The option names are case-sensitive. Two names are
listed for each resolution; the first (short) name is the value that
must be passed to -sPAPERSIZE, and the second (long) name is descrip-
tive. This option does not set GhostScript up to use a paper size
other than the default; it only tells the driver to set up the printer
for a different paper size. The default paper size is "Letter".
A complete list of available paper sizes may be found in gimpprintmediasizes(7)
.
COLOR BALANCING
Cyan=val
Magenta=val
Yellow=val
Brightness=val
Contrast=val
Gamma=val
Density=val
Saturation=val
A full description of the color balancing options, including the
allowed ranges of values, may be found in gimpprint-color(7).
DITHERING ALGORITHMS
DitherAlgorithm=algorithm
Possible values for algorithm may be found in gimpprint-
dithers(7).
OUTPUT TYPE
-sProcessColorModel=DeviceGray -dBitsPerSample=1
Black and white
-sProcessColorModel=DeviceGray
Greyscale
-sProcessColorModel=DeviceRGB
Color (RGB)
-sProcessColorModel=DeviceCMYK
Color (CMYK)
Note these are gs options, not IJS options. Choose color vs. grayscale
output. Color output is the default. Choosing DeviceGrey and
-dBitsPerSample=1 results in only black ink (no color ink) being used,
which is faster and usually results in the most accurate grayscale, but
at the expense of smoothness. This prints only black and white
(thresholding). This option always uses Fast dithering unless you
specify Very Fast. If you want composite color (using a mixture of
color and black inks to produce gray), use DeviceGrey.
In addition, using DeviceGrey uses luminance (perceived brightness) of
red, green, and blue to choose output levels. Blue of a given inten-
sity is perceived to be much darker than red, which in turn appears
darker than green. DeviceRGB, DeviceCYMK and Saturation=0.0 (see "Sat-
uration" above) do not use luminance.
CMYK output may be used with the IJS driver only. It is useful if
you're printing a CMYK graphic and want explicit control over the inks.
Generally it yields inferior quality, as Gimp-Print has good algorithms
for converting RGB (screen) into CMYK (inks) that take into account
paper type, ink type, and other variables. In CMYK mode, the bright-
ness, contrast, and saturation controls do not function.
IMAGE TYPE
This option can be used to optimize the dither.
ImageType=val
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 particu-
larly 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. Further-
more, it is possible to tune the color of the gray (to achieve warmer
or cooler effects) using the color controls in this fashion.
Specifying a lower GhostScript resolution (with -r) results in faster
color conversion. For example, if you print at 1440x720 DPI, but spec-
ify a Ghostscript resolution of 360 DPI (with -r360), output will be
significantly faster and there will be much less difference in perfor-
mance between the three image type options.
EXAMPLES
Note that a lot of these options are used for demonstration; generally
adjusting the density is a bad idea!
Example 1
Print charts to file, using A4 paper, color, 360 dpi:
gs -sDEVICE=ijs -sIjsServer=/usr/bin/ijsgimpprint
-sDeviceManufacturer=EPSON -sDeviceModel=escp2-ex -sPAPERSIZE=a4
-sOutputFile=itsyourchoice.prn
-sIjsParams=Density=1.6,Gamma=1.5,Saturation=0.9,Bright-
ness=0.4,ImageType=1
foo.ps
Example 2
Print color photograph to /dev/lp0 at maximum quality:
gs -sDEVICE=ijs -sIjsServer=/usr/bin/ijsgimpprint
-sDeviceManufacturer=EPSON -sDeviceModel=escp2-870
-sOutputFile=/dev/lp0
-sIjsParams='Quality=1440x720hq,MediaType=GlossyPhoto,Den-
sity=0.8,ImageType=2'
foo.ps
Example 3
Print pure black text to stdout:
gs -sDEVICE=ijs -sIjsServer=/usr/bin/ijsgimpprint
-sDeviceManufacturer=EPSON -sDeviceModel=escp2-660 -dIjsUseOut-
putFD
-sProcessColorModel=DeviceGray -dBitsPerSample=1 -sOutputFile=-
-sIjsParams='Quality=720sw,Density=0.8' foo.ps
HISTORY
The Ghostscript stp driver was originally written by Henryk Richter
(buggs@comlab.uni-rostock.de), and was integrated into Gimp-Print dur-
ing the 3.1 development series. Gimp-Print itself was originally writ-
ten by Michael Sweet <mike@easysw.com>, who released up to version 2.0;
Robert Krawitz released version 3.0. The gimp-print development team
(http://gimp-print.sourceforge.net) now maintains the entire package.
The IJS driver was originally written by Russell Lang, and incorporated
into Gimp-Print in early 2002. This driver corresponds with the IJS
protocol 0.32.
COPYRIGHT
Copyright (C) 2001-2002 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 program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MER-
CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
AUTHORS
Robert Krawitz. Originally written by Russell Lang.
This manual page was written by Robert Krawitz (rlk@alum.mit.edu) and
Roger Leigh (roger@whinlatter.uklinux.net).
SEE ALSO
gs(1), gimpprint-color(7), gimpprint-dithers(7), gimpprint-inktypes(7),
gimpprint-mediasizes(7), gimpprint-mediasources(7), gimpprint-mediatypes(7)
, gimpprint-models(7), gimpprint-resolutions(7).
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