Datacolor User to User Support Group.

Hi,

   I've completed a few more tests on both my HP DesignJet 130 and
Canon IPF5000 printers. It seems like I can marginally improve the
profile if I uncheck the absolute grays checkbox but it hasn't
eliminated the yellow/green cast I'm seeing on my prints. My best
profile so far seems to be with the Canon Premium Bright Photo Satin
paper. It also happens to be the whitest paper of the ones I'm
currently trying to profile. I don't know if that's significant but
figured it was probably worth mentioning.

   I've been running test prints on the Canon IPF5000 using the Print
Fix Pro monochrome test image, basically looking for a neutral gray
response. I'd say the Canon paper profile made with PrintFix Pro looks
pretty acceptable to me without any noticeable color cast. The Ilford
Smooth Pearl profile still has a noticeable yellow/green cast but it
has improved by using the suggestion to go with the relative grays
mode. It would probably be acceptable to some folks but is still
noticeable, especially when viewed against a neutral gray version of
the print.

   The HP DesignJet 130 hasn't improved much at all no matter what I
seem to try. I'm only printing in color mode on this printer as it
really doesn't do very good black and whites. I still have to resort
to using the canned HP profile for their Premium Plus Photo Satin
Paper as I really can't come close to it using PrintFix Pro. I just
keep getting the green/yellow cast, particularly noticeable on certain
prints. No cast with the HP profile.

   I've spent a fair amount of time creating different versions of
profiles. I don't mind tweaking a certain amount, particularly if I
might want to emphasize/deemphasize certain colors, but I do feel that
I should be able to produce a neutral profile without tweaking on my
part, particularly on the Canon printer.

   Question regarding the Spectro - When using it in measurement mode
do the reported values reflect calibration or is it reporting
uncalibreted Spectro data? For instance, if I perform the white
calibration using the tile on the Spectro holder I would expect the
measurement to report back zero for a and b values using the very same
tile. Is there a tolerance on this?

   Is there anything else I can do or try at this point in order to
get acceptable profiles?

Thanks,
Jim


--- In colorvision_group@yahoogroups.com, "bwinkjet" <bwinkjet@...> wrote:
>
> Hi,
> 
> Yes that is one issue.  Other profiles: those made with other
systems, canned profiles from 
> manufactorers, and custom profiles do not have this problem.
> 
> The other issue, to me, is that many people do NOT, or have not
reported this problem.  I 
> wonder if there is a variable that has not yet been uncovered that
causes certain of us to 
> have the same problem.  I was told that that my profile and readings
from my 
> spectrocolorimeter were correct:  however I have yellow prints
unless I correct the profile 
> with +20 blue.  
> 
> So, what is the variable?  Our eyes?  Overly critical demands?  Or
something about the PFP 
> 2.0 system itself?
> 
> Paul