Re: Epson 5000 Profiling
Re: Epson 5000 Profiling
- Subject: Re: Epson 5000 Profiling
- From: Steve Upton <email@hidden>
- Date: Wed, 24 Apr 2002 23:38:01 -0700
At 8:01 PM -0600 4/24/02, Andrew Rodney wrote:
>
on 4/24/02 7:07 PM, John Wawrzonek at email@hidden wrote:
>
>
> There is no question that the "no color adjustment mode" prints very
>
> dark, and that the linearization map must lighten everything a lot.
>
>
No Color Adjustments isn't really producing very good data but it's the best
>
we have (unfortunately). <snip>
>
>
I did try profiling using the "Automatic" setting with minimal settings
>
(saved in the driver) just to see what effect on profiling would produce. No
>
question the patches were much better appearing (I could actually see
>
separation with this setting that I couldn't see using NO Color Adjustment).
>
So far, this setting *seems* to be working with some very specific types of
>
images (neutral RGB images, that is, "grayscale"/B&W files in RGB). The
>
people I've talked to inside of Epson tell me this shouldn't work very well
and to stick with No Color Adjustments. <snip>
This use of automatic certainly is the cause for controversy on other mailing lists. It seems to neutralize the output somewhat as well as clean it up linearly.
I have been gathering information on its effects for while now and have come to a clear conclusion.
I was comparing raw targets printed with "No Color adjustment", "Automatic" and several contrast bumped settings. After measuring them all I did some graphing of the raw data and the resulting profiles. The gamut of the "adjusted" targets was - to the eye - reduced considerably and the data and profiles confirmed it.
The most interesting thing was that I recognized the attenuation of the yellows and cyans. They were "stunted" in a rounded-off regular kind of way... On a whim I overlaid the sRGB gamut and lo and behold they fit inside perfectly!! As expected the no-color adjust profile gamut was considerably larger than sRGB but it would seem that something in the adjusting pulls it into sRGB.
Scanner-based profiling packages seem to handle this sRGB-ized data better than the non-adjusted but we will continue to avoid it at all cost.
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
________________________________________________________________________
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