color mapping
color mapping
- Subject: color mapping
- From: "Vanderlinden, Thomas M." <email@hidden>
- Date: Fri, 6 Jul 2001 07:39:56 -0400
good morning, where ever the sun is, relative to you - - - - - -
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email@hidden>
asked
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What in simple terms is the difference between absolute and relative
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colorimetric
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rendering intents? Also Perceptual?
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This is what Adobe Photoshop 5.5 Help says on the question:
The CMYK Setup dialog box lets you specify the CMYK color space based on the
ICC profile of the printer you select. The CMM then maps the colors in the
image to the profiled printer's color gamut, or range of printable
colors.You can choose the method (called rendering intent) that is used to
translate the colors to the printed gamut.
To use ICC printer profiles to define the CMYK color space:
1 Choose File > Color Settings > CMYK Setup.
2 For CMYK Model, select ICC.
3 Select Preview to display a preview of your changes. A flashing bar under
the option indicates a preview is being created.
4 For Profile, choose the printer profile you want to use. If the printer
you use is not listed in the Profile menu, contact your printer manufacturer
for the appropriate printer profile or create one using third-party printer
profiling software.
5 For Engine, choose the CMM you want to use. Built-in refers to Photoshop's
built-in CMM.
Note: This option is not the same as choosing Built-in for CMYK Model.
6 For Intent, choose one of the following:
* Perceptual (Images) to maintain the relative color values among the
original pixels as they are mapped to the printer gamut. This method
preserves the relationship between colors, although the color values
themselves may change.
* Saturation (Graphics) to maintain the relative saturation values of the
original pixels. Out-of-gamut colors are converted to colors that have the
same saturation but fall just inside the gamut.
* Relative Colorimetric to leave colors that fall inside the gamut
unchanged. This method usually converts out-of-gamut colors to colors that
have the same lightness but fall just inside the gamut.
* Absolute Colorimetric to disable white point matching when converting
colors. This option is not generally recommended.
7 If desired, choose Black Point Compensation to map the darkest neutral
color of the source's color space to the darkest neutral color of the
destination's color space rather than to black when converting colors.
8 Click OK.
This may be true. I am not certain.
- - - -Tom Vanderlinden
TomV@BNBindery. com
Bridgeport National Bindery
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Message: 13
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Reply-To: <email@hidden>
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From: "JLKSHORE" <email@hidden>
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To: "colorsync" <email@hidden>
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Subject: color mapping
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Date: Thu, 5 Jul 2001 13:01:00 -0500
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Hello-
>
Here is a simple question I wouldlike to ask.
>
>
What in simple terms is the difference between absolute and relative
>
colorimetric
>
rendering intents? Also Perceptual?
>
>
Twin Image, Corp.
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1421 Gamon Road
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Wheaton, IL 60187
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630.221.8427