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In some cases we can <em>correct</em> the device output by altering
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the data we sent to it, but in other cases where that's not
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the data we send to it, but in other cases where that's not
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possible (you can't print electric blue) we need to show the user
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86
what the result is going to look like.
90
For photographs it makes sense allowing a relative shift of all
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colors to match color reproduction capabilities of a display or a
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printer, therefore you need to be able to access full tonal range of
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that display or printer. For other graphics such as logos you simply
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don't use the full tonal range, you only need few colors matching as
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closely as possible, so if you're trying to print a custom mug with
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the Red Hat logo, that <em>has</em> to be the exact Red Hat Red. The
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method of transferring colors from one tonal range to another is
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usually called gamut mapping.
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For photographs it makes sense to use the full tonal range of a color
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device, to be able to make smooth changes in color.
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For other graphics, you might want to match the color exactly, which
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is important if you're trying to print a custom mug with the Red Hat
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logo that <em>has</em> to be the exact Red Hat Red.