Re: [Lcms-user] Using lcms with cairo

[Bob F. <bfr...@si...>]

On Wed, 20 Jan 2010, Richard Hughes wrote:

> Is there any planned support for pre-multiplied image formats in lcms2? Thanks.

Color management has nothing to do with an alpha channel.  Lcms may 
accept (and preserve) an existing alpha channel as a means of 
convenience.  What you are requesting is to divert these 
un-premultiply/re-premultiply steps into lcms, with lcms adding any 
needed intermediate buffering.  This might help with application-level 
buffering but it adds additional responsibility to lcms which 
increases complexity and might reduce performance for the other cases.

Perhaps there is a better approach than moving the responsibility into 
lcms?

Bob
--
Bob Friesenhahn
bfr...@si..., http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/