[whatwg] Colour correction (was: Canvas ImageData comments)

Maciej Stachowiak mjs at apple.com
Sun Jan 20 15:36:24 PST 2008

On Jan 20, 2008, at 11:03 AM, Henri Sivonen wrote:

> On Jan 20, 2008, at 19:58, Darin Adler wrote:
>> But this rule not yet implemented in WebKit. Instead, when  
>> displaying on screen, today's WebKit treats untagged color as if it  
>> was in the system's primary display device's color space. This  
>> means that no color correction is applied to such colors.
> Yes, and the sRGB approach would Break the Web as long as the Flash  
> plug-in doesn't participate.

That's one reason we don't correct untagged colors yet, but this is a  
solvable problem.

>> or whether the Mac OS X gamma difference from Windows is important  
>> when designing this.
> The gamma difference is the foremost problem being "solved" but it  
> would be by far easier to solve by changing the Mac OS X default  
> gamma to match Windows. Computing color space transformation just  
> because Mac OS X is stuck with an unusual default gamma value is an  
> overkill. Sure, there are other color space differences, but most of  
> the time for most people, the non-gamma differences are less  
> important.
>> I think the sRGB design is a good one.
> I disagree. Why would you want a brand new Cinema display emulate  
> the gamut of an office CRT from the previous millennium potentially  
> by clipping instead of stretching the colors to gamut of the device  
> at hand?

Wouldn't changing the default gamma have essentially the same effect  
(with the added difference that even profile-tagged images could not  
take advantage of wider gamut)?


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