Re: Strange converion behavior
Re: Strange converion behavior
- Subject: Re: Strange converion behavior
- From: Graeme Gill <email@hidden>
- Date: Mon, 07 Feb 2005 12:57:51 +1100
- Organization: Argyll CMS
Mike Eddington wrote:
I was comparing some profiles created by different software packages
when I noticed this...I converted a Granger Rainbow from Adobe RGB to
CMYK using a profile created from GMB Profile Maker 5.0.2. Using a
perceptual rendering intent, I don't notice anything unsual in the
conversion. Obviously the color shifts and there's some banding, but
this is to be expected. Using the relative colorimetric intent (with or
without bpc) the saturated blues convert very strangley...becoming very
light in the center of the blue area. I've tried several GMB profiles
with similar results using rel. colorimetric. Anyone else notice this?
I've seen exactly this sort of thing in a profile that came with an EFI
copier RIP. I've no idea what tools EFI used to create the profile (a
saved profile had "EFI" in the profile header), but over a very narrow band,
the saturated blue went very un-saturated. Looking at the EFI saturated
intent profile in particular, it was obvious that the profile had been
extensively hand tweaked, and was far from smooth at the gamut surface.
Needless to say, an Argyll profile for the same device didn't show the
such anomalies.
Graeme Gill.
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