Re: Profiling the ip5000
Re: Profiling the ip5000
- Subject: Re: Profiling the ip5000
- From: Marco Ugolini <email@hidden>
- Date: Sun, 14 May 2006 15:56:12 -0700
In a message dated 5/14/06 1:55 PM, Dana Rasmussen wrote:
> Any thoughts on profiling this monster?
> With full RGB inks, do the standard patterns have enough samples in that
> area to produce a profile that covers the extended gamut?
> The profiles that I have generated in Profilemaker with 3600 patch targets
> from MeasureTool and Atkinson are showing some extension, but I am not sure
> they are taking advantage of the full gamut of the printer.
Hi Dana.
Judging from the specs published on the Canon site for the PIXMA iP5000
(<http://www.usa.canon.com/consumer/controller?act=ModelTechSpecsAct&fcatego
ryid=117&modelid=10439>), this is a 5-ink printer: 4 dye-based inks (which
the manufacturer calls "CMYK") plus a second Black ink, this one
pigment-based.
If we want to call this ink setup "full RGB inks," so be it. After all,
names don't mean much in this instance, and it all depends on what ink
primaries are being achieved.
On the other hand, I think your concerns regarding which testcharts to use
have no reason to be, if I interpret them correctly. It is a common
misunderstanding to think that testcharts must "cover an output device's
gamut" in order to be applicable. Testcharts do not have a defined gamut:
they simply provide the device a list of color numbers, and then the
profiling software measures what appearance those color numbers have
generated.
Different combinations of output devices and papers will produce different
color appearances when using those same color numbers. That is where color
profiling enters the scene, and assigns a device-independent meaning to the
color appearance produced by a specific device on a specific medium with a
specific set of inks.
As a final note of warning, it must be noted that some testcharts are
better-designed than others, therefore more likely to provide a platform of
measurement data from which to create a better-performing profile. These
better testcharts contain color numbers that are spaced according to more
exacting mathematical models, and/or provide more patches with the intention
of alleviating rounding errors in the profiling phase. From what I know,
Bill Atkinson's testcharts are probably unsurpassed in their ability to
provide a thoroughly detailed snapshot of the output device's capabilities.
Best regards.
--------------
Marco Ugolini
Mill Valley, CA
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