[argyllcms] Re: Dispcal, esp. gamma, advice?
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 12 Jun 2008 12:19:25 +1000
Ben Goren wrote:
So, first -- I now have a SoLux task lamp with a ``5000 K'' bulb that
actually measures to 4700 K (but only when I remove the diffuser...that
reduces it to 4200 K).
They are rated as being 4700K. Apparently if you increase the voltage
you can get 5000K, but the lamp life will be noticeably reduced
(the lifetime is roughly proportional to the inverse 12th power of
the voltage, so the effect can be dramatic).
Now, I'm wondering: just what parameters, exactly, should I use with
dispcal, and why?
See <http://www.argyllcms.com/doc8/monitorcontrols.html>.
And does it even make any difference with a color-aware application
like Photoshop? Would that mean I should target the native gamma to
avoid loss of resolution?
No. Yes. The gamma basically affects only two things:
Non-color managed applications.
How well controlled the display is, which affects how
well the display profile can work.
I've seen lots of opinions and recommendations everywhere, all over the
map. ``1.8 for print; no, 1.8 is outdated -- use 2.2; etc.'' I'd
appreciate some help getting un-confused....
If you're going to be using a color managed application, choose something
similar to the native display gamma. You can tell this is close by checking
that there is no dramatic shift in mid tone contrast when switching between
un-calibrated and calibrated. Typically most displays are setup to emulate
a traditional CRT, which has a native gamma of about 2.4. By encoding images
with a gamma of 2.2, a dim viewing environment contrast enhancement is
achieved when such images appear on a display with a gamma of 2.4.
Graeme Gill.
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