Rupert, that's wonderful news on a Sunday morning!  Thank you so much for your 
effort.


I'm not so good at understanding patches and things... If this is accepted, 
would it mean it would be available natively, without GEGL projection?

Since LAB uses a perception-based definition of lightness, this would 
effectively solve the Color mode problem, the two being two sides of the same 
coin.  What this means is that it makes a fix for our present predicament 
easier 
to release: as a completely new mode, the "LAB Lightness" would avoid the 
compatibility issue that a fixed Color mode would present.  Why didn't I think 
of this during the discussion?  So I would urge all concerned to initially 
focus 
on this new mode, and please consider an early release.

Thanks again,

Charlie



----- Original Message ----
> From: Rupert Weber <g...@leguanease.org>
> To: gimp-developer@lists.XCF.Berkeley.EDU
> Sent: Sun, August 8, 2010 5:12:03 AM
> Subject: Re: [Gimp-developer] Introduction / Color layer modes
> 
> Just uploaded a revised layer mode patch to
>     http://bugzilla.gnome.org/show_bug.cgi?id=325564
> 
> Good news:
> - is  about as fast as the legacy modes
> - adds Lab Burn mode
> 
> The Lightness  mode is really cool, because it effectively gives you Lab 
> contrast/brightness control:
>   - duplicate your layer (or make new  from visible)
>   - set top layer to 'Lightness (Lab)'
>   - Use  normal Curves, Levels, or whatever you prefer.
> 
> next thing I'll do is  rework the integer math routines, so they don't 
> require intermediate 64bit  ints -- and run  faster.
> 
> Cheers
> 
> Rupert
> 
> 
> 
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