best configuration for HP 970 cxi

[heat <cosimopiovasco@xxxxxxxxxxx>]

first ... what i have

slackware 8.1
apsfilter-7.2.2
ghostscript-7.05
gnu-gs-fonts-6.0
hpijs-1.2
ifhp-3.5.8
lprng-3.8.12

HP deskjet 970cxi  ->  driver 970|ijs/DESKJET_970 with twin configuration

############################################################
...from printcap file 

deskphoto|ijs/DESKJET_970;r=600x600;q=photo;c=full;p=a4;m=auto:\
    :lp=/dev/lp1:\
    :if=/etc/apsfilter/basedir/bin/apsfilter:\
    :sd=/var/spool/lpd/deskphoto:\
    :lf=/var/spool/lpd/deskphoto/log:\
    :af=/var/spool/lpd/deskphoto/acct:\
    :mx#0:\
    :sh:
desk|ijs/DESKJET_970;r=600x600;q=high;c=full;p=a4;m=auto:\
    :lp=/dev/lp1:\
    :if=/etc/apsfilter/basedir/bin/apsfilter:\
    :sd=/var/spool/lpd/desk:\
    :lf=/var/spool/lpd/desk/log:\
    :af=/var/spool/lpd/desk/acct:\
    :mx#0:\
    :sh:
############################################################
... from deskphoto -> apsfilterrc 

PRINTER='ijs/DESKJET_970'
PAPERSIZE='a4'
METHOD='auto'
QUALITY='photo'
COLOR='full'
RESOLUTION='600x600'
GS_FEATURES='-sDEVICE=ijs-sIjsServer=hpijs-dIjsUseOutputFD-sDeviceManufacturer="HEWLETT-PACKARD"
-sDeviceModel="DESKJET970"-sIjsParams="Quality:Quality=2,Quality:ColorMode=2,Quality:MediaType=2,Quality:PenSet=2"'
############################################################
... from desk-> apsfilterrc 

PRINTER='ijs/DESKJET_970'
PAPERSIZE='a4'
METHOD='auto'
QUALITY='photo'
COLOR='full'
RESOLUTION='600x600'
############################################################

.. the problem ...

B&W and Color doc are well printed in both configurations;
photo doc (*.jpg) are better printed with deskphoto (...obvious ...) but :
-	color quality is the same that in Windows print
-	resolution is better in Windows print ( ...damn!!)

... What can I do ??? 

Thanks..