Re: confusion about gamma settings
Re: confusion about gamma settings
- Subject: Re: confusion about gamma settings
- From: Terry Wyse <email@hidden>
- Date: Thu, 8 Dec 2005 12:46:25 -0500
On Dec 3, 2005, at 5:36 PM, Mark wrote:
I always see people saying that having a different gamma on
different monitors will cause the image to look different.... which
makes sense to me.
It will only look different in UN-color managed applications. Any
application that is color-managed and properly previews/soft-proofs
using a proper monitor profile will show NO difference even with
different target gamma settings. All the latest Adobe apps and even
Apple's Preview application will preview correctly and consistently
regardless of monitor gamma setting. Your "desktop" and Finder will
obviously appear darker/lighter depending on the gamma you chose but
that's it.
What I don't understand is how that's possible when you're using
photoshop as it's supposed to compensates for all that stuff. If
I'm using 5000k and 1.8 on one system, won't the image look the
same on another running 6500 and 2.2 when I'm in photoshop? Same
thing with working spaces..... doesn't matter what I use (gamma of
working space vs. gamma I have set on my monitor) because photoshop
compensates, no?
With the exception of monitor white point, the images will look
basically the same.
The only thing I can think of is people not using photoshop. If
these other programs don't understand profiles, what exactly
happens? I thought the icc monitor profiles loaded some curves into
the video card LUT so programs that didn't do profiles could still
show an accurate image.
Can anyone clear up my confusion?
In Photoshop terms, un-color managed applications will basically
assign your monitor profile to the image. That's it.
And speaking of gamma, I downloaded the coloreyes display demo to
see what the L* stuff is all about. When I use that, will the
resulting gamma be closer to 1.8 or 2.2? I'm just curious what I
will see vs. someone who doesn't really have a calibrated display
whether they're on a mac or pc. I'm assuming calibrated (and in
photoshop) won't matter.
While the L* tone curve can't be described in terms of "gamma", it's
closer to 2.2 in appearance (closer to 2.4 actually). It's a good
choice by the way.
In terms of "what to do" about all of this, if you know your images
may be viewed by someone using an un-color managed app, simply
convert in Photoshop to the most likely choice for their viewing:
AppleRGB or ColorMatchRGB for Mac users and sRGB for Windoze users.
If you convert and EMBED this profile, it will look right to folks
using both color-managed and un-managed apps.
Regards,
Terry Wyse
_____________________________
WyseConsul
Color Management Consulting
email@hidden
704.843.0858
http://www.wyseconsul.com
http://www.colormanagementgroup.com
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