Datacolor User to User Support Group.

Hello All,

   It seems that there's been a few issues regarding a green/yellow
cast in profiles created with PrintFix Pro. I'm picking up on Will's
thread below as it seems like his final questions relating to this
issue were not answered, although it is possible I missed it.
   I'm currently using version 2.0 of the software and have
experienced this issue on a number of paper and printer combinations.
Most recently, I've created several profiles for my Canon IPF5000
printer using Ilford Smooth Pearl and Canon Premium Bright Photo Satin
paper. Both profiles exhibit the green/yellow color cast, particularly
noticeable on color skin tones and black and white prints. Setting
paper white reference seems to have greatly improved the Canon paper's
profile but not much effect on Ilford. The Canon paper is noticeably
whiter than Ilford Smooth Pearl. In each case I'm using the 225 patch
color target in addition to the extended gray target.
   I also have experienced the same issue on my Hp DesignJet 130 using
HP Premium Plus Photo Satin paper. I've tried a few times but have
never been able to get an acceptable profile, with or without paper
white compensation. This printer/paper combination gives the most
noticeable color cast with the Print Fix Pro profile.
   I could try playing around with the color sliders to compensate for
the color cast but do not want to get into tweaking each profile
individually in order to compensate for this. It's also pretty
difficult to do this using the softproof function because the cast is
difficult to notice on the monitor, but definitely there on the prints. 
   I'm wondering if there isn't some inherent issue with background
paper white compensation. The papers that have given me the most
trouble seem to be the ones that are not pure white. The yellow/green
cast is subtle but as I mentioned above is most noticeable on skin
tones and Black & Whites.
   Any help to resolve this would be appreciated.

Thanks,
Jim


--- In colorvision_group@yahoogroups.com, "willruggles" <2rcp@...> wrote:
>
> Thanks David (and Paul). Will here.
> 
> My original post (1705) got all this going and has unfortunately been
> lost in the shuffle I am afraid with the paper white ref riding to the
> top of the conversation. Relative to that I have a few comments and
> questions.
> 
> I do habitually click the Paper white reference, not because of
> knowledge of exactly what it does, but because it makes sense to me
> since it is taken from having read the "white" of the paper and this
> would be a logical addition to the profile.
> 
> Also, as I said in the original post, I use 5000K on my monitor
> calibration and a 5000K light so I am matched, though not at the temp
> you suggest. Does this matter? Matched light with a calibration at
> 5000 versus 6500? If it does, I have not been successful in finding
> this array of lights you spoke of. Lots of "daylight spectrum", but
> the ones I found were 5000-6000K. On the GE sight all I could find at
> 6500 were normal fluorescents. Can you suggest a place to find compact
> fluorescent bulbs or desktop/floor lamps that are 6500K?
> 
> Third, I was aware of the slider change as my post says. I am also
> aware that the green/yellow shift is very noticeable after taking 967
> readings to create the profile. Now that I am aware that I can expect
> up to 13 blue and 6 magenta to balance the color it will be easier to
> make profiles. It does seem bizarre and unexplainable to me though,
> that such a complete color reading from colors printed by my own
> printer and viewed on my very good, calibrated monitor could be
> calculated in a way that would be so far off as to have what is
> visually an extreme color cast. Can you explain this to me? Have I
> done something wrong?
> 
> Fourth, relative to my Lacie lcd monitor, and the eizo I tried, they
> do "look" more blue/magenta than my old Samsung calibrated to the same
> color temp with the same software/colormeter. This is why I was
> wondering if there was some potential for interpretation of neutral
> color? On these high-end monitors, the grays are definitely evener
> from white to black with no color casts in any area of the gray scale,
> and though they do have a bluer/more magenta "feeling" they look
> decidedly gray to me. Can this be a part of this issue of green/yellow
> cast?
> 
> On your suggestion, I printed the gray test print from PFP through my
> new profile and the largish gray panel next to the black one, just
> left of the word Colorvision measures L=52.2, a=.32, b=1.30. I have no
> knowledge of LAB. Can you interpret this? Or can you point me to a
> good and simple tutorial that describes how to use LAB measurements? I
> am wondering if this could be used as a pointer to adjusting profiles
> accurately? Can it tell you whether to be looking at red rather than
> magenta for example? or green versus yellow?
> 
> Finally, can you give me any insight into the dual monitor question I
> asked in post 1705. I'm using a Mac and have the menus and tools on
> one monitor that  I assume the Mac and Photoshop see as the primary
> monitor since this is the desktop monitor. I like having my good
> monitor completely empty except for the photo, therefore I put all the
> menus on the other one. So the photo viewing monitor is what the Mac
> considers the secondary monitor. The question is, does Photoshop/the
> Mac "know" which monitor the photo is on as it initiates color managed
> workflow? As I said in that post, to be safe, I have chosen the
> profile of my photo viewing monitor in the preference of the monitor
> that has the menus and desktop just in case the Mac needs that for
> proper color management. This is tedious though and makes profiling
> the tools monitor sort of irrelevant. Thus the question. Can you help?
> 
> Thanks very much,
> 
> Will