re: Hexachrome
re: Hexachrome
- Subject: re: Hexachrome
- From: Dan Reid <email@hidden>
- Date: Mon, 17 Jun 2002 13:03:10 -0600
On Sun, 16 Jun 2002 16:28:20 EDT, email@hidden wrote:
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Hi All
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One of the favorite subjects!
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I'm in the process of getting hold of a Hexachrome plus inkjet printer.
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The end use is aimed at producing color swatches to a high degree of color
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accuracy, and potentially some at quite high chroma (hence the Hexachrome)
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I was wondering what software packages i need to get the most from the
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printer.
Your best all around package for spot color matching or custom colors would
be Gretag ProfileMaker v4. MonacoProfiler v4 and Creo ProfileWizard v2.5
also create Hexachrome (six channel) ICC profiles but lack a spot color
editor. The ProfileMaker's spot color editor supports measurement devices
directly and does a good job of automatically cleaning-up scum dots. nColor
ICC profiles are also supported with palettes compliant with Photoshop and
Illustrator.
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>From what I can gather most software package such as Photoshop 6 (presently
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using) will only allow you to effectively access the CYMK color space of the
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potentially CYMKOG printer?
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is this true?
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If so what software packages are Hexachrome compatible
Photoshop does not directly support Hexachrome color model. Using Pantone's
HexImage plugin or HexVector provide the means to separate to six channels
and save out either DCS 2.0 or EPS that is pre -separated. If you are using
a Roland printer the ScanVec RIP has tables to separate a RGB image for you.
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There is a Hexachrome supplied with the rip so am i better getting some
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customized software written to maximize potential access to CYMKOG space?
Definitely. If you can control ink limits and linearization you will have
superior results.
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One other issue is truncation of color data, i noticed when using Photoshop 6
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that Lab space is only to 0dp, with subsequent truncation of accuracy,
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especially in the light colors. I realize that the printer itself may not
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differentiate between these color in terms of drop lay down, but obviously
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don't wants software truncation making it more difficult to get these
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discreet light colors, as I said before the color accuracy requirement is
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very high.
Then use a RGB workflow. Your input devices are always RGB not LAB.
Converting from RGB to Hexachrome is the ideal workflow.
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Just wondering if anyone knows any protocols or data on assessment, or
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assessing the colour variation from inkjet printers? particularly the ffect
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of paper, temperature, humidity variation?
That's why you want a RIP that offers calibration features using a color
measurement device. By maintaining your calibration of dot gain
(linearization) you will compensate for ambient conditions.
--
Dan B. Reid
RENAISSANCE PHOTOGRAPHIC IMAGING
http://www.rpimaging.com | email@hidden
Toll Free: (866) RGB-CMYK
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