[Openicc] Printing targets: App or driver ? Profiling RGB or CMYK

Robert Krawitz rlk at alum.mit.edu
Tue May 17 18:49:33 PDT 2011

On Tue, 17 May 2011 19:39:18 -0600, Chris Murphy wrote:
> On May 17, 2011, at 6:58 PM, Robert Krawitz wrote:
>> On Tue, 17 May 2011 18:15:22 -0600, Chris Murphy wrote:
>> It's possible that the printers have individual calibration tables; I
>> don't know.  It might be interesting to put a USB tap on the
>> bidirectional communication and analyze what flows in each direction.
>> The sRGB path (ESC/P-R) is pretty straightforward.
>> But I don't know about this "repeatability between prints" thing.
>> Unless there's evidence that there's a problem with, say, Gutenprint
>> but not with the OEM driver, it sounds like FUD.  One test would be to
>> take a look at print to file with the OEM driver that's then sent to
>> the printer vs. print directly to the printer.
> I've done this test myself with the OEM driver versus various RIPs
> that either use Epson's HTM, or implement their own driver. Only the
> OEM consumer driver has this consistency such that the same profiles
> really do work quite well between printers. Without it, absolutely
> for proofing, probably for more discerning photographers, per
> printer custom profiles are necessary.

You realize that profiles for the OEM driver won't necessarily be any
good at all for other drivers, right?

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