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11.11.96. Initial release of the driver
25.08.97 Version 1.2. Resolved all but one of the
known bugs, introduced a couple
of perfomance improvements. Complete
new color-transfer-function handling.
(see gamma).
01.06.98 Version 1.3 Due to the most welcome contribution
of Martin Gerbershagen ([email protected]),
support for the hp670, hp690 and hp890
and hp1600 has been added. Martin has also
resolved all known bugs.
Problems : Dark colors are still pale.
The diver needs no longer special switches to be invoked
except -sDEVICE=cdj850, or -sDEVICE=CDJ890, or sDEVICE=CDJ670
or -sDevice=CDJ1600
The hp690 is supported through the hp670 device, the hp855, hp870 and the hp1100 through the hp850 device.
The driver implements the following switches:
-dPapertype= 0 plain paper [default]
1 bond paper
2 special paper
3 glossy film
4 transparency film
Note, currently the lookuptables are not suited
for printing on special paper or transperencies.
Please revert to the gamma functions in this case.
-dQuality= -1 draft
0 normal [default]
1 presentation
-dRetStatus= 0 C-RET off
1 C-RET on [default]
-dMasterGamma= 3.0 [default = 1.0]
__Note__: To take advantage of the calibrated color-transfer
functions, be sure not to have any Gamma-Statements
left! If you need to (i.e. overhead sheets),
you still can use the gamma-functions, but they will
override the built-in calibration. To use gamma in the
traditional way, set MasterGamma to any value greater
1.0 and less 10.0. To adjust individual gamma-values,
you have to additionally set MasterGamma to a value
greater 1.0 and less 10.0
When using the driver, be aware that printing in 600dpi involves
processing of large amounts of data (> 188MB !). Therefore, the
driver is not what you would expect to be a fast driver ;-)
This is no problem when printing a full sized color page (because
printing itself is slow), but it's really annoying if yoy print only
text pages. Maybe I can optimize the code for text-only pages in a
later release. Right now, it is recommended to use the highest
possible optimisation level your compiler offers....
For the time beeing, use the cdj550 device with -sBitsPerPixel=3
for fast proof-prints. If you simply want to print 600dpi b/w data,
use the cdj550 device with -sBitsPerPixel=8 (or 1).
Since the printer itself is slow, it may help to set the process-priority of the gs-process to regular or even less. On a 486/100MHZ this is still sufficient to maintain a continuos data-flow. Note to OS/2 users: Simply put the gs-window into the background, or minimize it. Also make sure, that print01.sys is invoked without the /irq switch (great speed improvement under warp4).
The printer default settings compensate for dot-gain by a calibrated color-transfer function. If this appears to be to light for your business-graphs, or for overhead-sheets, feel free to set -dMasterGamma=1.7.
Furthermore, you may tweak the gammavalues independently by setting -dGammaValC, -dGammaValM, -dGammaValY or -dGammaValK (if not set, the values default to MasterGamma). This will only work, when -dMasterGamma is set to a value greater than 1.0.
If you want to learn more about gamma, see: http://www.erdw.ethz.ch/~bonk/ftp/misc/gammafaq.pdf
http://www.erdw.ethz.ch/~bonk/ftp/misc/colorfaq.pdf
Note: Depending on how you transfered the files,
you might need to remove some CR-codes used on intel-based machines:
simply type: unzip -a hp850.zip
to compile with gs5.x, add
DEVICE_DEVS4=cdj850.dev cdj670.dev cdj890.dev cdj1600.dev
to your makefile.
BTW, it is always a good idea to read make.txt found in the gs-distrib before attempting to recompile.....
Feel free to mail feedback or problems to