On Jul 4, 2009, at 15:01 , Max Rabkin wrote:
On Sat, Jul 4, 2009 at 8:38 PM, Andrew Coppin<andrewcop...@btinternet.com> wrote:3. It doesn't appear to provide arithmetic over colours.It provides darken, blend and addition (though addition is called mappend rather than (+)). signum, abs and fromInteger don't make a huge amount of sense for colours.
I don't see a good meaning for signum offhand, but fromInteger could take an X11-encoded RGB value and abs could produce grayscale brightness.
-- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH
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