Re: Best Color Management Practices for Web Image Creation
Re: Best Color Management Practices for Web Image Creation
- Subject: Re: Best Color Management Practices for Web Image Creation
- From: Chris Murphy <email@hidden>
- Date: Mon, 21 Jul 2008 23:40:10 -0400
On Jul 21, 2008, at 3:44 PM, Harmon, Jeff wrote:
Why can't vision-based calibration/profiling systems dial in primary
values?
Seems straight-forward enough to my "knows-enough-to-be-dangerous"
mind.
- Jeff
The human visual system isn't a colorimeter, but it is a good
comparator. So I think you'd need something to compare the display
colors to.
What we really need is to not push this back onto users. We need to
push this back onto manufacturers. I would like to know more about how
far off EDID reporting is from actual chromaticities of displays in
use, and the median and standard deviation are. I think it's
potentially pretty bad if this MacBook Pro can be reliably measured
with an Eye One Pro. If its reported values for this display are
correct, then it would seem even Apple is not immune to presenting
rather highly incorrect values in EDID. This bugs me, because I seem
to think Apple would do a better job, which leads me to think a good
portion of the rest of the market would be worse off. But of course I
really have insufficient data, other than to say I'm concerned.
I'm not sure what body to pressure, to get EDID reporting
chromaticities closer to reality.
Also, OS X polls EDID for chromaticities and white point. So any
default profile built by the system will be based on that display's
EDID. So what we need to compare is that profile to a custom build
one. But not merely on a technical level but in evaluating images on-
screen as well, and in particular in comparison to no conversion
(assuming monitor RGB for the data) because that might be better than
using an EDID based profile in some (many?) cases.
Chris Murphy
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