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Re: Profiling Colorspan Displaymaker XII/72
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Re: Profiling Colorspan Displaymaker XII/72


  • Subject: Re: Profiling Colorspan Displaymaker XII/72
  • From: Henrik Holmegaard <email@hidden>
  • Date: Wed, 20 Feb 2002 09:29:33 +0100

Neal Singleton <email@hidden> wrote:

The resulting print is more or less as I would expect, except that the
darker coloured squares are almost black - rows 16 and 17 in particular. The
resulting prints from the created profile are reasonably good in the
highlights and mid tones but the shadow areas are seriously filled in.
I realise that the evidence in the printed TC 3.5 suggests that too much
black is being generated but I cannot find anywhere in the RIP software
which will allow me to control black generation.

You're looking to put the cart before the horse, I'm afraid.

The RIP must apply ink limiting and the test chart must show proper differentiation in the darker patches before you go on to measure the test chart and build the ICC profile.

If the RIP does not apply ink limiting in the first place, you're dead, ditched and down. The ICC profiling software can't change the measured values and can't restore a broken gamut. What's broke is broke.

Ink limiting is a piece of cake with the DesignJets. Find a paper that works well with any of the built-in ink limiting / density calibration procedures, load the paper, calibrate the process, print the test chart, allow the obligatory drying time, measure the test chart, set max CMYK to 400% and black start for GCR to 40% or whatever other approach your profiling software uses to keep blacks out of highlights and midtones, and hit the 'Build' button. Now your RIP controls the ink limiting, your ICC profile controls color and black replacement and you're addressing the maximum gamut of the process.
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