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 21:12:57 -0700
On Dec 13, 2003, at 7:49 PM, Jim Sims wrote:
I was wrong. I keep beating this up so that I understand how to handle
web images.
John Gnaegy said, "Safari assumes untagged images to be in the space
of the default display's profile." Which I misinterpreted to mean,
arbitrarily taking an image and assigning it the profile for my
display which can't be what he is saying.
"assign" is an Adobe term. When a profile is assigned to a document in
an Adobe application, that document is explicitly tagged (i.e. a
profile is not being assumed), and by default it will be embedded when
the image is saved.
So your original meaning is effectively correct in that Safari/Preview
will assume monitor RGB for untagged images. The display profile is
both source and destination, resulting in a null transform.
The shortest and most logical path for unknowns - raw RGB + monitor
RGB = best guess color
Leaving gamma as the real cross platform display problem to overcome.
It seems to me there are two pretty clear options: deprecate gamma 1.8
in favor of 2.2, or implement display compensation with sRGB as the
assumed source for untagged images. I'd like to see both happen because
one is a short term workaround (square plug for round hole vs. no plug
at all); and the other is a long term fix that's much better. It would
also help stamp out mystery meat RGB if untagged images are equated to
sRGB. If that's not OK, then something else needs to be embedded.
Time to Google gamma, why 1.8?
I've asked everyone I can think of, and the closest creation myth for
gamma 1.8 we (the authors of Real World Color Management) came up with
was that a display gamma of 1.8 approximated the tone response of the
original laserwriter. Thus, grayscale images on-screen would look
pretty close to what was printed on the laserwriter. Fact or Fiction?
There are other stories too.
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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| References: | |
| | >Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Steve Upton <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: John Gnaegy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Jim Sims <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Jim Sims <email@hidden>) |