Re: Printing color on HP682C

[Stephen Casner <casner@xxxxxxx>]

On Mon, 18 Jun 2001, Michael Loßin wrote:
>
> See also:
> http://www.linuxprinting.org/show_printer.cgi?recnum=75520

Thanks; I had not looked there because I'm not running linux, but I
guess the ghostscript aspects are system independent.

> Is "hpdj680c" part of the original ghostscript release, or is it
> just a patched-on driver? Using "hpdj" with a generic model is
> probably some completely different approach.

It is included in the pre-built "AFPL Ghostscript 6.50 (2000-12-02)"
installed as the ghostscript-nox11-6.50_6 package which was installed
by the apsfilter-6.1.1 package as a dependency.  Also included is
pcl3, but not cdj670.

> > tried "lpr -C cmyk test.ps" to print the test page again.  That does
> > print in color, and the RGB triangle looks reasonable, but the CMY
> > triangle doesn't look right: the vertices are near white, and there
> > are sharp color boundaries in a Y shape dividing the triangle into
> > three arrowhead shapes.  The color along the line from C to Y
> > increases in yellow to the color boundary at the midpoint where the
> > color changes to saturated cyan and fades heading toward the Y
> > vertex.  Is that what I should expect?
>
> What you should expect is what you see when you view the test page
> with gv, or with gs on the command line.

I tried that, but got no output.  I realize now that it was because
the ghostscript-nox11-6.50_6 package superceded the ghostscript-6.01 I
had installed previously.  Now with the full ghostscript-6.50_6 or
with a test.ps printed on an HP4500DN (very nice!), I see that the CMY
triangle I described above is indeed wrong.

> Apparently, the 682C is not directly supported by "hpdj" (which
> may be caused by glitches like the ones you've seen). It seems
> that the 682C was omitted intentionally.

But the 680C is listed in aspfilter/setup/printer-hpdj -- is that an
error?  (The Windows driver from HP is for "680C series", so the
difference between 680 and 682 should not be significant, although it
is interesting that man gs-hpdj lists 670, 672 and 680 but not 682.)

I see that the linuxprinting.org site does not list 680 or 682 for
hpdj.  For 682 it lists cdj670, pcl3 (maybe something has been fixed
in development since the rename) or DJ6xx (hpijs).

> > if I define GS_FEATURES="-sColorMode=CMYK", I still get only b/w
> > output.
>
> Maybe the option is something different for the actual "hpdj680c"
> driver. Please read the documentation for that driver, if available.

Unfortunately, no man gs-hpdj680c.

> If you are a brave soul, you might try to use the latest ghostscript
> in connection with the pcl3 or hpijs driver. But you also have to use
> the latest, on-the-edge, unofficial and largely untested :^D
> preview of apsfilter-7.0...
>
> http://briefcase.yahoo.com/losse   -> Software -> apsfilter-experimental
> http://home.t-online.de/home/Martin.Lottermoser/pcl3.html
> http://hpinkjet.sourceforge.net/

It looks like pcl3 is an easy next step with venturing to 7.0.  I'll
try some things.  Thanks for your help.
							-- Steve