Re: Panther, sRGB, web browsers
Re: Panther, sRGB, web browsers
- Subject: Re: Panther, sRGB, web browsers
- From: Chris Murphy <email@hidden>
- Date: Sat, 13 Dec 2003 13:26:35 -0700
On Dec 12, 2003, at 4:14 PM, John Gnaegy wrote:
Safari assumes untagged images to be in the space of the default
display's profile. This is the same behavior as Preview, so the nice
thing is an image opened in Preview looks the same as an image opened
in Safari, whether it has an embedded profile or not.
The problem is the image in Safari has a nearly 100% chance of being
displayed incorrectly, unless the image origin is the machine currently
displaying the image, and from an application that doesn't use display
compensation, or the editing space is based on a gamma 1.8 tone
response.
Another problem is with ColorSync Preferences which explicitly states
that the default profile selected will be used when a document does not
contain embedded profiles, yet that's obviously not occurring, nor is
it at all clear when it does occur.
If you have multiple displays you can set which one is the default
using ColorSync Utility. Assigning any profile to untagged data is
always a guessing game since you have no idea what the creation
environment was. A case could have been made on either side of the
issue, either assuming sRGB or assuming the display's profile,
basically a no op. I imagine the choice came down on the side of
assuming the display's profile for untagged data in order to have a
unified behavior with other cocoa apps on the system.
These concerns are easily solved by deprecating gamma 1.8. Even though
we still end up without display compensation, at least there is a far
better chance that people will see web images (and increasingly images
from digital cameras as well) in the ball park. Gamma makes a bigger
difference than most anything else other than maybe gray balance, and
right now Mac users start off at a disadvantage with gamma 1.8 tone
response.
Those who want gamma 1.8 tone response should have the burden of making
it happen (through calibration). Everyone else, i.e. the vast majority,
should not have to do anything. That implies gamma 2.2 by default, in a
world that still heavily depends on monitor RGB.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management"
Published by PeachPit Press (ISBN 0-201-77340-6)
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