Re: Re: CIE color definitions in CSS3 color module

My main focus was on Lab and Luv.....
I do not know how this got to be a fight about XYZ, how about we put that  
issue away
and focus on Lab and Luv, with a white point of D65. oh and by the way it  
is a simple calculation
it is a 3x3 matrix multiplied by a 3 vector plus a clamp. as are all color  

On Sep 18, 2010 11:25am, Alan Gresley <> wrote:
> Tab Atkins Jr. wrote:

> I would much rather wait for a hypothetical future display device to

> become real before trying to address its needs. Engineering to meet

> predicted future needs has a generally poor track record on the web.

> Agree.

> Note, as well, that CSS generally assumes that colors exist in the

> sRGB colorspace, and defines interpolation for things like transitions

> and gradients in terms of that space.

> ~TJ

> Yes, that is the challenge, it is not simple algorithms. For CIE xy

> chromaticity space and CIE xyY color space [1] we see this.

> [snip]

> 1.


> If there's no simple algorithm to convert from CIE spaces to sRGB,

> then this is dead in the water, isn't it?

> Yes, remember I didn't propose this. I protested it.

> Browsers work with colors

> in sRGB.

> Correct.

> You can sometimes specify colors that officially lie outside

> the sRGB gamut, but it's clamped appropriately when actually fed to

> the device.

> Really, what are they?

> If there's no good algorithm to convert from CIE colorspaces to the

> gamut used by current devices, and no actual devices that display

> colors in the CIE colorspace gamuts, then what's the use of specifying

> colors in a CIE colorspace today?

> ~TJ

> No use as yet for the holy grail of color spaces. This is why I believe  
> Alexis or whoever should focus more on other color spaces [1] such as LAB  
> [2], LUV [3], HVS and most importantly CMYK [4] which is used for  
> printing.

> 1.>

> 2.>

> 3.>

> 4.>

> --

> Alan

> Armies Cannot Stop An Idea Whose Time Has Come. - Victor Hugo

Received on Saturday, 18 September 2010 02:00:54 UTC