Bug#950690: cups-filters: Printing fails with an error about Grayscale/monochrome conversion

[Till Kamppeter <till.kamppeter@gmail.com>]

I have tried it also and with the command line

cupsfilter -p ../HL5250DN.ppd -i text/plain -m 
application/vnd.cups-postscript -e ~/.bashrc > out.ps 2>log

I got valid PostScript output with a PJL header. Note that I had to 
specify both input and output MIME types.

Probably in the cases whenthe printer does not print CUPS sends valid 
PJL and PostScript but some PostScript interpreter bug in the printer 
prevents it from printing.

You can try to send the PostScript output of the command line above to 
your printer without further filtering, either do

lp -d <Printer> -o raw out.ps

or

nc -w1 <printer IP> 9100 < out.ps

Please try.

   Till