Digital BW, The Print

Carl Schofield wrote:

> Daniel & Tyler,
> 
> Here are some spectral plots (eye-one measurements) for a 50% gray 
> patch printed with an Epson 2200 (UC inks) using the Epson driver and 
> neutral, carbon, and sepia QTR profiles.  The spectral distribution of 
> the QTR pure carbon 50% gray (K + LK) is smooth and the added LM + LC 
> in the neutral QTR 50% gray and LM + Y in the QTR sepia 50% gray 
> introduces some variations in the spectra, but not enough to cause 
> visible metamerism.  In contrast, the Epson driver gray is highly 
> metameric and the spectrum exhibits sharp fluctuations in spectral 
> intensity.  The x axis in the plot should read wavelength in nm and not 
> epson driver.

Nice!

Ever seen the gamut shape of the original Epson 9000 dye ink
profiles in a 3D profile viewer ?  If you try to custom profile
the same inks with any available profile creator you never get
that shape as wide as Epson got it.  Inflation of the gamut with
the saturation slider in the editor I guess. Not the right
approach for neutral greys and consistent color.

There's a profile editor that uses the original ICC CMYK printer
profile but takes out as much color as possible for a grey only
ICC profile (Rich Grey ?), will work like QTR in a sense, long
black generation etc. Someone mentioned it on the colorsync list
a long time ago.

Ernst