Re: Best Color Management Practices for Web Image Creation
Re: Best Color Management Practices for Web Image Creation
- Subject: Re: Best Color Management Practices for Web Image Creation
- From: Chris Murphy <email@hidden>
- Date: Tue, 15 Jul 2008 14:30:29 -0400
On Jul 15, 2008, at 2:26 AM, Steve Upton wrote:
1. The web page developer needs to be able to turn color management
off. Until ALL page elements can be color managed *reliably* THEY
need to have the control. I have been dealing with several customers
who are frustrated with Safari color management when trying to place
flash graphics on top of other page elements which are supposed to
match (and blend). Flash doesn't get color managed, the background
element does and color management gets a black eye.
W3C has bailed on color management. There is no mechanism in CSS2 or
CSS3 to turn color management on or off.
What I've suggested, but haven't heard from the players on, is a way
for the web browser and Flash player to have a brief conversation
about their capabilities. If both can perform color management, then
they both do it, if they can't then it's all off. This coordination
would prevent the problem you talk about, while also not requiring web
designers become involved in something they know absolutely nothing
about, and will stay away from even more than the typical graphic
designer.
While Flash 10 is supposedly color managed, what's not clear is if
this is only opt in, or if Flash Player will assume sRGB as source and
color manage the result by default. If there must be explicit opt in
for this, the whole venture will continuously be falling flat on its
face until there is a wood shed event. (And it very well may be end
users who are getting beaten up.)
2. Because of #1 AND because color professionals and advanced users
NEED to have control for testing, we need to ensure that users have
control over whether color management is applied or not. That said,
I agree with the long-term policy of having color management on as
the default.
I don't know why we need any control for color management in a web
browser. It's a general purpose application. Even Photoshop's "Perform
Display Compensation" went the way of the Dodo bird.
In any event, about:config as far as I know will remain a mechanism
for enabling and disabling color management in FireFox.
I haven't talked to the webkit folks, but if they're at all like Apple
they will shun such a control. If the ducks are in a row and it will
help far more users than it will hurt, they'll just turn it on, say
nothing, and give no option at all to modify the behavior.
but hang on here... why do we care how far the EDID and display
chromaticities are off sRGB?
The comparison to sRGB is how different displays in use are deviating
from sRGB. People think they are targeting their content for sRGB, but
since they are increasingly viewing the result without color
management on a cheap so called "average" display, they really aren't
seeing the correct color.
If we are talking about color management in browser and EDID-based
auto-profiles (for lack of a better term) then aren't the numbers we
are looking for the EDID-based profile vs the Eye-One Pro
profile?... judging from the dE numbers it looks like there will be
a fair amount of difference... but how much is it?
Correct. If EDID is frequently misreporting actual behavior by a
substantial amount, to the degree the user gets a worse experience
with color management than without it, enabling color management at
all would be a big problem.
Also, can you supply more info about how the profiles were
constructed and whether they shared the same white point, etc...?
EDID profile was built by OS X. I haven't checked to see what it
thinks the white point was prior to adaptation to D50, and also based
on vcgt I went with native white when producing the display profile,
which was done with Eye One Match. If you want the profiles, let me
know.
Chris Murphy
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