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GElste
04-03-2010, 07:35 AM
How does Spot-On control screen tints of Pantones when less than 100% of a color is used? Does it use an algorithm based on the alternate color values? How do we best control and validate that 50% is truly 50%. Especially when comparing to other technologies that either have dot gain, different screening, or use different algorithms than the Fiery.

It is also my understanding that Spot-On is influenced by calibration, but is enabled after calibration. How does this effect the results?

SharonH
04-06-2010, 08:08 AM
Hello,
All spot colors are handled within Spot-On. For Pantone Libraries Spot-On will store all the L*a*b* values of the Spot-Colors, as provided under license from Pantone, and will create a unique mapping from these L*a*b* values to the chosen output profile. So each and every time a new output profile is loaded, Spot-On will generate a new L*a*b* mapping of the spot colors to the output profile because each and every output profile is slightly different. This allows the best possible mapping of all the spot colors to the engines gamut capabilities as determined by the profile.

When you are using tints, lets say, an 80% tint, then Spot-On will calculate the 80% L*a*b* value from the L*a*b* of the solid spot color. This goes for all tint values, they are calculated on the fly based on the L*a*b* value of the solid spot color. All these tints, in L*a*b* space, are then uniquely mapped to the given output profile.

If you use Spot-On to edit the solid color, then the tints will also be adjusted accordingly. That is when you edit the solid color, the tints are based on the percentages of the new L*a*b* of the solid color.

Within the Fiery, if you wish to use the alternate color values of the spot tints then you just have to turn Spot Color Matching off.

GElste
04-13-2010, 09:02 PM
Sharon,

Thank you for your response. One other question.

If using a screening other than the default, how can I get closer results between 2 different screening patterns using Spot-On? Basically if I calibrate / profile to a particular screening than that output profile should know the color space based on the screening. However, Spot-On returns clearly drastic differences when the screening is changed. What's the best way to color manage an environment that wants to change the screening on a per job basis, and maintain color integrity across the entire Spot-On library?

SharonH
04-14-2010, 08:31 AM
Hello,
It is known that in general the screening can change the color output. Thus for color critical environments it is recommended to profile for the different screens you are using.

Sharon