Re: Profiling the ip5000
Re: Profiling the ip5000
- Subject: Re: Profiling the ip5000
- From: Marco Ugolini <email@hidden>
- Date: Wed, 17 May 2006 21:42:47 -0700
In a message dated 5/16/06 4:38 AM, Roberto Michelena wrote:
>> Assigning a profile to a testchart? That doesn't sound right to me...
>
> The printer is not really RGB; while we expect the drivers for the
> operating system to receive data in RGB, that's not the case for the
> Photoshop Plugin whose purpose is precisely to avoid that extra step.
> I am assuming the Photoshop Plugin converts whatever it's in the
> window (an image in whatever colorspace tagged with a corresponding
> profile) directly to 16-bit Lab and then to the printer's 12-ink color
> space. If you feed it something wider than the printer's space, such
> as ProPhoto RGB or Wide Gamut RGB, you'll actually be exploring the
> boudaries of the printer's gamut.
>
> -- Roberto Michelena
> Infinitek
> Lima, Peru
Roberto,
Isn't it the point of printing an *untagged* testchart to submit to the
driver raw color *numbers* -- in all manners of combinations from 0 to 100
in CMYK or 0 to 255 in RGB in all channels -- not married to any specific
source space, and let them fall where they may in the output device's space?
This would seem to translate into a thorough exploration of the full gamut
of the target device, because the simple act of funneling those color
numbers into different color spaces -- including the color space of a 12-ink
inkjet -- generates widely variable color appearances. And all of this
without tagging the source.
That would seem to me the whole point of (1) using "Same as Source" (now "No
Color Management") and (2) of making sure that the driver does not introduce
any alterations of its own to the colors. Or am I mistaken here?
Regards.
--------------
Marco Ugolini
Mill Valley, CA
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