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

Robert Krawitz rlk at alum.mit.edu
Wed May 18 05:47:11 PDT 2011

On Tue, 17 May 2011 20:24:14 -0600, Chris Murphy wrote:
> On May 17, 2011, at 8:09 PM, Chris Murphy wrote:
>> Anyway, I have a 3880 here on the network and can either put it on
>> the router DMZ if you want; or can take some pointers on what files
>> to print, and how to configure tcpdump to capture Epson driver vs
>> 3rd party RIP so you're getting relevant info.
> Also have multiple 7900's at another location. Using two it would be
> possible to compare RGB streams going to the two 7900's, compared to
> the two CMYK(deviceN probably) streams going to those same two
> 7900s.

We need to have the same RGB streams input to each printer.  Otherwise
the comparison is useless.

> Does Epson's Mac OS/Windows driver itself converts to deviceN on the
> host computer? Or is it possible the RGB path to the printer is how
> this calibration data gets used by the native driver, and the
> deviceN path doesn't?

I would be very surprised if the RGB path to the printer (which to the
best of my knowledge is sRGB), if it even exists on this device, is
used, simply because sRGB is too limiting.

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