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

[Chris Murphy]

On May 17, 2011, at 7:54 PM, Robert Krawitz wrote:

> On Tue, 17 May 2011 19:48:30 -0600, Chris Murphy wrote:
>> 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,
> right?

We know from Epson that they have some kind of calibration at factory that's somewhere on the printer. I also have heard there's some encoding of ink variance in the chips on the ink cartridges. I don't know if that's true. But if we accept that there's factory calibration, it's somewhere in the printer.

This ColorBase product, which I have not used, "saves a history of calibration data" which tells me that it's saving the data locally. However, if you started to print from another computer to the same printer and got different results, that would be a FUBAR workflow. So my expectation is this software also somehow uploads either new calibration information to the printer, or supplements/corrects the calibration information that's already in the printer.

*shrug* speculation.


> It sure would be interesting to capture some print jobs and take a
> look at them...

The printers I use are only connected via Ethernet. I never use the USB interface. That should in some ways be easier with tcpdump, but there might be other network clutter to sort through.

Chris Murphy