Printing pictures creates "%!PS-Adobe-3.0 ..."

My Linux is openSuSE 11.1, HPLIP version is 3.9.12.
My printer is a HP Photosmart C4680 connected via USB.
The setup is fine, the printer is visible, but when I try
to print the test page then I get ASCII Postscript output
on the paper:

%!PS-Adobe-3.0
                          %%For: (user)
                                                 %%Title: (tmpojWm_C)
                                                                                     ....

I raised the loglevel in cupsd.conf to debug, but the file
/var/log/cups/error_log shows no problems. When I run
hp-check it says "No errors or warnings".

Why does the printer put the PostScript data stream on paper?
Why doesn't it print the picture?

Regards,

Mark

$ lsusb
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 03f0:7411 Hewlett-Packard
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

excerpt from hp-check:
---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------

Photosmart_C4600
----------------
Type: Printer
Device URI: hp:/usb/Photosmart_C4600_series?serial=CN98BM33MY05B
PPD: /etc/cups/ppd/Photosmart_C4600.ppd
PPD Description: HP Color LaserJet 4600 v3010.107 Postscript (recommended)
Printer status: Drucker Photosmart_C4600 ist inaktiv. Aktiviert seit Mi 23 Dez 2009 19:53:26 CET
Communication status: Good

----------------------------------------------------------------------------------------------------------------------------
Finally I fixed it. I needed to extract the correct printer driver from the tarball
and manually put the file hp-photosmart_c4600_series.ppd.gz into directory
/usr/share/cups/model/HP. Now I could set up the printer with the correct
printer driver. I just wonder why HPLIP tried to use a LaserJet driver (with PS support)
for a PhotoSmart printer.