[argyllcms] Re: Cannot get calibration/profiling to yieldgoodresults, user error?
- From: "Alastair M. Robinson" <profiling@xxxxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 02 Jan 2009 20:03:55 +0000
Hi,
Karl H. Beckers wrote:
Then I'll try your other suggestion with the gamut-mapped profile, though it
all sounds like my hopes of using my (not sooo bad) laptop, when my two old
Sony OEM CRTs turned out to be just too dim, have been defeated and I need some
new displays ... Bummer.
OK - good luck :)
My own laptop's screen is far from great, but using that trick myself
does provide some pretty reasonable, if not great, results.
There was a typo in the comment in my previous mail, BTW:
> # We profile a "reference" profile with the -S parameter - usually sRGB,
This line should, of course, have read "We provide..."
The gamut mapping trick could probably do with a little more
explanation, because it's a useful technique. Without the -S parameter
the profile will operate in Relative Colorimetric intent even if
software has asked for Perceptual. Relative Colorimetric intent
basically asks the colour management system to match colours perfectly
where possible, but for those colours that can't be matched, just pick
the nearest.
By providing a "reference" profile with the -S parameter, we're
essentially saying "Here's a set of colours we're particularly
interested in - making these look 'nice' is more important than absolute
accuracy."
The result is that relationships between colours are preserved (such as
the detail in the parrot's head) even if overall accuracy has to be
sacrificed as a result.
This technique is used more commonly for printer profiles than display
profiles, but it can help for those too.
Hope this helps :)
All the best,
--
Alastair M. Robinson
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