Datacolor User to User Support Group.

This thread prompted me to inquire about something I'm having a problem
with. I have been trying to print a tinted B%W image and I'm not happy with
the results. The highlights have a pinkish tone that shouldn't be there. The
profile I'm using was created with the regular 225 patch and the Extended
Grays target.

 

To figure out what's going on I tried printing a neutral 21 step wedge. The
steps from 30% down to 5% all have a slight pink (sort of a bluish  magenta)
hue. I tried printing the same step wedge with my original profile (made
without the extended grays) and the pink hue is also there but also extends
up into the mid tones to about 60% black.

 

The other thing I've noticed is that the gray ramp (plot of L* against
%black) is not very linear, particularly with the profile made with the
Extended Grays target. In fact, the ramp produced by my original profile
(made without the Extended Grays) is more linear.

 

So my question is: has anyone made a profile that has been able to produce
good neutral black and white images? If so, which targets did you use to
make the profile? Before I print and measure the 729 patch plus extended
grays over again, I thought I'd check to see if it's been done successfully.


 

The other question I have pertains to the quote from Mr. Tobie below. When I
created the profile with the extended grays target, the time taken to
calculate the profile was virtually identical to the time required to
produce the profile without the extended grays. In both cases it took 1 or 2
seconds, nowhere near enough time to have a coffee. Also the 2 profiles are
the same size (possibly that could be normal). So, although the "Extended
Grays" profile was an improvement, I'm wondering if I missed something in
its creation.

 

Any suggestions? Am I expecting too much from S3Print?

 

Tom Moore

 

  _____  

From: colorvision_group@yahoogroups.com
[mailto:colorvision_group@yahoogroups.com] On Behalf Of CDTobie@...



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Please keep in mind that gray mode profiles such as this take much longer to
calculate than color profiles. When the "build profile" step is reached,
leave your computer, have a cup of coffee, and don't panic if its still
working when you get back. Do not assume it has frozen, just let it run its
course and it should produce the profile you are looking for.



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