[Openicc] Printing targets: App or driver ? Profiling RGB or CMYK
rlk at alum.mit.edu
Tue May 17 18:54:51 PDT 2011
On Tue, 17 May 2011 19:48:30 -0600, Chris Murphy wrote:
> On May 17, 2011, at 7:12 PM, Robert Krawitz wrote:
>> On Wed, 18 May 2011 03:09:02 +0200, edmund ronald wrote:
>>> I don't think the inter-device repeatability thing is FUD. Epson has a
>>> utility called ColorBase .
>> But it requires an external device (it specifies a Gretag MacBeth or
>> X-Rite color measurement device). That sounds like it profiles the
>> printer. A very nice convenience indeed, but it doesn't sound like
>> special sauce within the printer.
> Appears to only use the Epson print driver (nothing else is
> mentioned), so my take on this product is that it is merely
> updating/replacement (maybe supplementing?) the calibration tables
> formed by Epson in the printer - which in turn purportedly are only
> accessible or used with the Epson OS native print driver. Not even
> their own HTM has access to this path apparently.
It states "Use with GretagMacbeth or X-Rite colour measuring
devices". That sounds to me like it needs an outboard measuring
device. From that, it certainly could store information on the host,
> The biggest differences I've seen printer to printer is with the
> 100% coverage of each colorant. By yanking down, sometimes
> substantially, on the per channel ink limit, everything else pretty
> much falls in line. On one printer I may need a 98% standard cyan
> limit, and another another printer with same lot # paper and ink and
> firmware it may be 91% - totally different amounts of ink.
> Whereas with the RGB Mac OS driver, I get virtually the same L*a*b*
> value for 0,255,255 on those same two printers. Clearly these are
> NOT the same colors being tested - but there's still much greater
> consistency between printers when using the OS native driver from
It sure would be interesting to capture some print jobs and take a
look at them...
Robert Krawitz <rlk at alum.mit.edu>
Tall Clubs International -- http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- http://ProgFree.org
Project lead for Gutenprint -- http://gimp-print.sourceforge.net
"Linux doesn't dictate how I work, I dictate how Linux works."
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