Digital BW, The Print

FYI Epson Tech UK said this is not a linearization of the printer.

It's interesting to note that the 4800 maintenance manual says the 4800
supports "Colorimetric Calibration" which "corrects not only the weight of
ink droplets which differs according to the characteristics of [the]
individual printhead but variable factors such as drive circuit and voltage,
which provides a higher accuracy calibration.  The calibration is performed
by printing a correction pattern with a completed product and measuring the
color of the pattern using a calibrator." The correction value is written to
the NVRAM on the main board.  "The printer driver reads the correction value
stored in the NVRAM during printing, and correct[s] the dot generation
amount for each dot size in the print data."

I wonder if this is in effect what Colorlab does with the "correction value"
read not from the NVRAM but rather from wherever it is stored on your
computer.  Personally I do not understand it.


> From: Ernst Dinkla <E.Dinkla@...>

> 
> Automatic calibration on the printer itself would indeed be
> very nice. However that would mean a spectrometer embedded in
> the hardware and that would add to the price. It has been done
> though on printers from other manufacturers. The best so far
> on Epsons has been the automatic nozzle control on the 10000CF.
> 
> Last month Epson introduced ColorBase for the
> 9800/7800/4800/2400 models and combined with a separate
> Spectrometer this is the best you can get in calibration on
> Epson printers now. It isn't done automatically, the
> calibration data isn't kept in the firmware of the printer but
> at least it means a calibrated base for the Epson driver + the
> Epson Stylus RIP. I was a surprised that it wasn't extended to
> support third party RIPs too but the Colorsync list seemed
> surprised with the introduction so I doubt third party RIP
> manufacturers were informed at all. We discussed Colorbase
> some weeks ago.
>                     --
>            Ernst Dinkla