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<title>HP PXL Jetready Project FAQ</title>
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<ul>
<li>What is this?</li>
</ul>
<div style="margin-left: 40px;">PXLJR (<a
href="http://sourceforge.net/projects/hp-pxl-jetready/">http://sourceforge.net/projects/hp-pxl-jetready/</a>)
is an IJS-based driver for the HP
JetReady 4.x protocol printer family (Color Laserjet
3500 and 3550) under linux and other unix-like systems. This effort is
not endorsed by nor affiliated with HP.<br>
<br>
It is licensed under the terms of GNU General Public License.<br>
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<ul>
<li>Compiling and Run-time requirements?</li>
</ul>
<div style="margin-left: 40px;">About the same as HPIJS. PXLJR needs a
C compiler rather than a C++ compiler, and also need
automake/autoconf (this may be improved in later release). <br>
</div>
<ul>
<li>HPIJS/HPLIP also supports these two printers. Why are you
"reinventing the wheel"?</li>
</ul>
<div style="margin-left: 40px;">HPIJS (<a
href="http://hpinkjet.sourceforge.net">http://hpinkjet.sourceforge.net</a>)
provides 2 printing modes: one color and one gray, corresponding to the
max-compression/worst-quality setting of the HP driver under Windows.
There are two more settings for better quality in the Windows driver.
PXLJR provides these two additional settings, so there are a total of 6
printing modes. Also, the max-compression gray mode of PXLJR is 1.5 to 3
times faster.<br>
<br>
One the other hand, PXLJR doesn't provide a full set of facilities like
printer status report, etc. For other bells and whistles, please use
HPLIP's toolbox instead. There is no conflict installing both HPIJS and
PXLJR simultaneously.<br>
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<ul>
<li>Why did you not improve HPIJS instead?</li>
</ul>
<div style="margin-left: 40px;">There are professional reasons that I
need to maintain autonomy; on the other hand, the two addtional quality
settings are already in the Windows driver. The HPIJS people can
consult their Windows driver people and there is no need for me to
contribute; the other improvement - the speed for the gray modes -
would require substantial modification, and affects and changes code paths
that I cannot test due to not have the other printers.<br>
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<ul>
<li>Any other improvement I can do to my prints?</li>
</ul>
<div style="margin-left: 40px;">There is a file 'gs-gamma.ps' which
changes the gamma curve and boasts the shadow details if one
prepends it to a print-job.<br>
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<ul>
<li>Known problems, Limitations?</li>
</ul>
<div style="margin-left: 40px;">The right-hand border for PXLJR is
about 0.5mm wider than HPIJS. I haven not been able to track it down,
but the difference is only noticeable if one prints all the way to the
edge of the printerable area, and compare side-by-side.<br>
<br>
Standard page size (A4, letter, envelope, etc) works, but custom
arbitrary size only works on 32-bit small endian. (i.e. x86). HPIJS has
a similiar and worse problem - and both will be resolved in the
corresponding next releases.<br>
"make install" installs too many unnecessary things, and does not
install the ppd. Only really only need<br>
to copy the ijs_pxljr into /usr/bin and the ppd into a CUPS specific
place. <br>
</div>
<ul>
<li>Upcoming improvements?</li>
</ul>
<div style="margin-left: 40px;">Making dependence on libjpeg optional.<br>
Make Multiple-copies option work. Currently if one wants X identical
copies, one needs to send job X times.<br>
Make the gamme curve change a more user-friendly option.<br>
See if a 1-bit B/W version can go even faster.<br>
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