On Ubuntu Natty (Ghostscript 9.01) and Oneiric (Ghostscript 9.02) I have a problem with the IJS printer driver interface when used with the PXLJR driver (http://sourceforge.net/projects/hp-pxl-jetready/, in Ubuntu installed by default). The draft and normal printout modes of the driver make Ghostscript abort with a "Unsupported color conversion request" error, the high quality printout mode works correctly.

The Ghostscript command line for the draft mode is the following:

gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dQUIET -dNOPAUSE -sDEVICE=ijs -sIjsServer=ijs_pxljr -sDeviceManufacturer="HEWLETT-PACKARD" -sDeviceModel="hp color LaserJet 3550" -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -dDuplex=false -r600 -sIjsParams=Quality:Quality=1,Quality:ColorMode=2,Quality:MediaType=0,Quality:PenSet=2,PS:MediaPosition=7 -dIjsUseOutputFD -sOutputFile=- file.pdf > out.prn

file.pdf is an arbitrary PDF file.

grepping /usr/lib/ for the error message "Unsupported color conversion request" shows that it is only in libjpeg, but the problem occurs also with PDF files which contain only text.

In the case of failure, out.prn contains the following Ghostscript error message:

Error: /ioerror in --showpage--
Operand stack:
   1   true
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1910   1   3   %oparray_pop   1909   1   3   %oparray_pop   1893   1   3   %oparray_pop   --nostringval--   --nostringval--   2   1   3   --nostringval--   %for_pos_int_continue   --nostringval--   --nostringval--   1793   0   9   %oparray_pop   --nostringval--   --nostringval--
Dictionary stack:
   --dict:1167/1684(ro)(G)--   --dict:1/20(G)--   --dict:82/200(L)--   --dict:82/200(L)--   --dict:108/127(ro)(G)--   --dict:295/300(ro)(G)--   --dict:23/30(L)--   --dict:6/8(L)--   --dict:21/40(L)--
Current allocation mode is local
Last OS error: 32

For normal mode we have the same command line but with "Quality:Quality=0" and for the (working) high quality mode with "Quality:Quality=2".