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Why don't drivers use a CMYK profile?
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Why don't drivers use a CMYK profile?


  • Subject: Why don't drivers use a CMYK profile?
  • From: Dan Caldwell <email@hidden>
  • Date: Mon, 13 Nov 2000 08:08:10 -0800

Dan Caldwell <email@hidden> writes:

The real reason that any OS level print drivers do not use CMYK
profiles is that neither Microsoft or Apple OS is capable of sending
CMYK data from the OS. The only way a printer can receive CMYK (or
more channels) is via Postscript.

Chris Murphy wrote>>>

The original poster was wondering why we can't select CMYK profiles
within the driver ITSELF so that ColorSync can do the required RGB to
CMYK conversion at the driver level instead of it being based on tables
internal to the driver.

I think the biggest reason is probably what Bruce and a couple of others
have said, which is that the separation from RGB to CcMmYK is heavily
dependent on the screening algorithm. So pixel by pixel RGB to CMYK
conversion (which is what ColorSync would do) is probably inappropriate,
and insufficient.


No Chris, the reason is if the driver called ColorSync to make the conversion the resulting file could not be sent to the printer as QuickDraw can only send RGB (or three channel) data from the OS.

Dan Caldwell
ProfileCity.com
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    • Re: Why don't drivers use a CMYK profile?
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