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

Chris Murphy lists at colorremedies.com
Wed May 18 11:02:18 PDT 2011

Yeah it seems like the native driver is flagging the stream in such a way that the printer passes the data through this calibration in-printer. And it need not be even table or curve based. If they just had per channel ink limits, that would make a huge difference.


On May 18, 2011, at 8:14 AM, edmund ronald wrote:

> my feeling is that whatever calibration there is is stored on the
> printer itself, i dont think the driver gets any info back from
> downstream. Also, Epson drivers can do AdobeRgb, i think they have
> precomputed sRgb and AdobeRgb to DeviceN links, and the printer has
> DeviceN calibration burnt in; that's my guess but then what do I know?
> Edmund
> On 5/18/11, Robert Krawitz <rlk at alum.mit.edu> wrote:
>> 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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