Posted by
Duane and Julie on
URL: http://imagej.273.s1.nabble.com/RGB-to-L-a-b-Conversion-tp3703729p3703732.html
Michael,
I agree that sRGB has a smaller gamut, but you deal with what you've
got. :-) I picked sRGB as my uncalibrated space because it's the
only one where we know the phosphors. It's also more prevalent
nowadays. You will note in the code I posted that I actually convert
to XYZ from whatever and then on to whatever is requested. The
problem is, when's the last time you found a camera that put out XYZ?
duane
On Feb 11, 2006, at 4:45 PM, michael shaffer wrote:
> Duane writes ...
>
>> RGB is an uncalibrated space, L*a*b* is a calibrated space.
>> That said, if you assume the RGB to really be sRGB you can do
>> a conversion that is probably what you want, or close to it.
>>
>> I wrote a color space converter, [...]
>
> Given that sRGB is a much smaller gamut than L*a*b ... It
> wouldn't be much
> more difficult to convert from one of the larger gamut color
> spaces ...
> e.g., ProPhoto. Granted, there are few devices that can take
> advantage of
> large gamut color spaces, but sRGB (... A de facto monitor
> standard ...)
> seems too small to be worthy of a conversion to L*a*b.
>
> ... Just a suggestion ...
>
> Genuinely, Michael Shaffer :o)
>
> SEM/MLA Research Coordinator
> (709) 737-6799 (ofc)
> (709) 737-6790 (lab)
> (709) 737-6193 (FAX)
>
http://www.mun.ca/creait/maf/>
http://www.esd.mun.ca/epma/>
> Inco Innovation Centre
> c/o Memorial University
> 230 Elizabeth Avenue
> P.O. Box 4200
> St. John's, NL A1C 5S7