[argyllcms] Re: 0.60 CMYK profile misshaped

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 08 Dec 2006 13:50:47 +1100

Gerhard Fuernkranz wrote:

Burckhart Seifert wrote:
The linearization is made within the RIP. I detected the maximum
density for the cyan channel at 97%.

> Graeme, when you look at the plots, what do you think? Should the
> channel be cut-off earlier, somewhere below 100%, or is it still
> reasonable as is? At least dE from white is still monotonically
> increasing up to 100% cyan (though pretty flat from 70...100%).

You've done a more detailed analysis than I have, but my impression
from the self fit errors in the profile, and the shape of the per channel
curves being generated was, that a somewhat lower limit would make
for a more accurate profile at the expense of some gamut. Somewhere
between 70-80% may be a good place to start. While the dE to white
may be increasing, if it's severely flattened off it's not much good.
There's no point in making the profile highly inaccurate, to gain another
couple of deltaE of gamut size.

Graeme Gill.

Other related posts: