Re: some thoughts on CIELAB
Re: some thoughts on CIELAB
- Subject: Re: some thoughts on CIELAB
- From: "Bruce J. Lindbloom" <email@hidden>
- Date: Sat, 08 Feb 2003 14:04:03 -0600
We should all realize that some of the "problems" being discussed in this
"Lab bad!" discussion do not necessarily have to do with the ICC, or even
Lab itself. The fact that colors of constant Lab hue angle do not appear to
have the same visual hue is really not a problem. Lab was not designed to
have this property and never claimed to have this property. Those
individuals or vendors who choose to move out-of-gamut colors along such hue
angles are *misusing* the color space. That's not Lab's fault. Put the blame
where it belongs. (I have been guilty of committing this sin also.)
In ICC land, Lab may be used as the PCS. PCS means "profile connection
space" which is a way of exchanging or communicating color information. The
choice of Lab for this purpose is perfectly valid. The fact that an Lab hue
angle does not show constant perceptual hue is irrelevant in this context.
Vendors who make profiling software are free to map out-of-gamut colors
using whatever color spaces, sophisticated algorithms or secret sauce they
wish. After the mapping of the color is done, simply convert to the Lab PCS
and stick it in the ICC profile table. Profiles made this way will not
suffer the problems caused by the so-called "flaws" of Lab.
--
Bruce J. Lindbloom
email@hidden
http://www.brucelindbloom.com
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.