Colour management with inkjet printers

On Wed, 19 Jul 2006 18:28:58 -0700, Andrey Tarasevich
<andreytarasevich DeleteThis @hotmail.com> wrote:

>Raphael Bustin wrote:
>> ...
>> CMYK is 100% device-specific, and there is no unique
>> representation of any given color in CMYK space. So
>> basically, any conversion *out* of CMYK space is at
>> best an educated guess.
>> ...
>
>The fact that there is no unique representation of any given color in
>CMYK means that any conversion *out* of CMYK space is strictly defined,
>while conversions *to* CMYK space have to employ "educated guesses".


I don't follow that logic at all. Any CMYK gamut is device-
specific. In likelihood, there will be clipping or compression
during the conversion to CMYK. Those tones are forever
lost and cannot be recovered in the conversion back to
CMYK.

There are other issues as well. Try sending a CMYK file
through any standard print driver. You'll get caca, because
of the implicit CMYK to RGB conversion that precedes
the final separation.

Unless you are printing through a real bona-fide CMYK
RIP, there's no point converting an image to CMYK.


rafe b
www.terrapinphoto.com