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: Steve Upton <email@hidden>
- Date: Mon, 14 Jul 2008 23:26:18 -0700
At 12:55 AM -0400 7/15/08, Chris Murphy wrote:
>On Jul 14, 2008, at 9:44 PM, Harmon, Jeff wrote:
>>I submitted the request for Firefox 3 to permit turning on color management
>>in the preferences UI, rather than in a config text file. Was this done?
>>Can anyone else please request this, if not?
>
>So far I've expressed opposition to a UI option for color management. In my view, the connotation of a UI option translates into "color management is optional." In this case I think it will terribly confuse users to have this option, and it will prolong the inevitable transition.
>
>If there is a way to explode inconsistency of color on the web, having some users using a web browser with color management off, and others with it on, with an option as to which camp they're in, would be a pretty good way to do that. And as people get web browsers and leave them on their machines often for a year or more at a time, I think an option is incongruent with a timely transition to full color managed web browsers.
Understood (and agreed with... mostly) but I think that we need several things in place before color on the web is going to make sense AND can simply be turned on and left on in all cases.
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.
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.
>On the flip side of this, having it on by default by FF 3.1, which is currently planned but I don't know when that version would ship, might be a problem due to bad EDID data from displays being used to build display profiles on the fly. This is how Mac OS X has worked for a very long time to the point where it's assumed most everyone has such a profile in use now. That is the profile FireFox will be using, except for the rathe small percent of the market using a custom display profile. (This is a web browser, and a consumer market, not at all the same thing as a Photoshop market).
>
>Just as an FYI how big of a difference, here's one example (perhaps a pretty bad example) for a MacBook Pro (LED) revision 4,1. Using DeltaE 2000, where DeltaC = difference in chroma, and DeltaH = difference in hue. This is JUST for the blue primary, the red primary and green primary aren't as dramatically affected but aren't all that close to sRGB's primaries either.
>
>
>EDID vs sRGB
>
>DeltaC 21
>DeltaH 13
>DeltaE 8
>
>EyeOne Pro vs sRGB
>
>DeltaC 43
>DeltaH 37
>DeltaE 23
>
>Either way, there is a rather large deviation in the blue primary for this MacBook Pro compared to sRGB's blue primary. And based on the EyeOne Pro's measurements, Apple's reporting of the primary via EDID is even farther off, which is pretty pathetic if true. If Apple can't compel their vendors to get it right, what about other vendors?
but hang on here... why do we care how far the EDID and display chromaticities are off sRGB? 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?
Also, can you supply more info about how the profiles were constructed and whether they shared the same white point, etc...?
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
________________________________________________________________________
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