Oce Arizona 250 GT User Manual page 129

Color and Profiling Hints and Tips
[27]
Situation
Setting Ink Restric-
tions
Increasing Ink Den-
sity
Using a generic
ICC profile
PhotoShop RGB to
CMYK conversion
Hitting Pantone
Colors
Choosing a Spec-
trophotometer
Hint and Tips
The Arizona 250 GT uses greyscale variable drop size tech-
nology. Some of the larger drop sizes are not allowed for a
particular print mode. When settings restrictions ensure the
following drop sizes are set to zero for the following print
modes:
Production & Fine Art Modes - level 6&7, Quality Mode
level 7.
Also, when setting restrictions take into account that at some
point adding an additional volume of ink will not increase
the Dmax. Setting the optimal Dmax depends on your objec-
tive, if the goal is to have rich saturated colors and the largest
color gamut possible you should choose a higher Dmax and
if your goal is color accuracy and producing images in ac-
cordance to SWOP standards. For SWOP standards you may
want to choose Dmax values that are about 0.1 higher than
the SWOP targets of C,M 1.4, Y .8, K 1.6.
Use ICC profiles. Or use color replacement to change
100%K to a rich black. 40% C, 30% M, 30% Y, 100 %K
have given good results on a variety of media. The maximum
recommended values are 60% C, 40% M, 40% Y, 100% K.
If an ICC profile is not available for a particular media and
it is not possible/convenient to create one specifically for
that media, select an ICC profile for another media that is
similar in composition and color and the results will very
likely be acceptable. Profiles are much less media-depend-
ant for UV ink printers like the Arizona 250 GTthan for sol-
vent ink-based printers.
When converting RGB images to CMYK in PhotoShop we
recommend that you use a 400% ink limit a, 20% dot gain
compensation, and light black generation. Good results have
been achieved printing linearized with all profiles turned off.
Use ICC profiles and change default rendering intent from
Saturation to Perceptual.
Onyx ProductionHouse supports a variety of Spectropho-
tometers for profiling. Our recommendation for a spectro-
photometer that can be used on both rigid and flexible media
is the Gretag MacBeth Eye-One (with a UV cut filter).
Hints and Tips
129