Re: LAB as working/interchange space
Re: LAB as working/interchange space
- Subject: Re: LAB as working/interchange space
- From: Henrik Holmegaard <email@hidden>
- Date: Mon, 28 May 2001 08:18:10 +0200
Chris Cox <email@hidden> wrote:
ICC Lab has a limit of +-128 on the chrominance channels.
Phil Green <email@hidden> wrote:
The +/-127 limit is not just a feature of the ICC spec but of TIFF and
other common encodings.
Photoshop 6 wrote:
An integer between -128 and 127 is required
The Photoshop 6 manual wrote:
In Photoshop, Lab mode (the asterisks are dropped from the name) has a
lightness component (L) that can range from 0 to 100. The a component
(green-red axis) and the b component (blue-yellow axis) can range from
+120 to -120.
If we add Chris and Phil, divide by 0.5, and delete the Photoshop 6
manual, I'd say we're roughly in the right ball court -:).
(BTW the numbers game is something different from the workflow game,
that is, the game of media independence and profile independence, and
there should be a more comfortable balance, but there isn't,
unfortunately.)