From: Bill White <billw@wolfram.com>
Cc: w3-beta@indiana.edu, ding@gnus.org
Subject: Re: HTML foreground and background colors being the same... poll time!
Date: 03 Dec 1998 08:56:16 -0600 [thread overview]
Message-ID: <ruok9096zqn.fsf@banshee.wolfram.com> (raw)
In-Reply-To: "William M. Perry"'s message of "Thu, 3 Dec 1998 09:00:21 -0500"
In message <199812031400.JAA09195@kramer.bp.aventail.com>,
"William M. Perry" <wmperry@aventail.com> wrote:
> b is pretty easy to implement:
>
> (defun infer-contrasting-color (r g b)
> (if (and (<= r 255)
> (<= g 255)
> (<= b 255))
> (format "#%02x%02x%02x"
> (logxor r 255)
> (logxor g 255)
> (logxor b 255)))
> (format "#%04x%04x%04x"
> (logxor r 65535)
> (logxor g 65535)
> (logxor b 65535)))
For (r g b) = (127 127 127) this would return (128 128 128) - not
much contrast :-(
bw
--
Bill White . billw@wolfram.com . http://www.wolfram.com/~billw
I have discovered a truly wonderful proof of Fermat's Last Theorem,
but unfortunately this .signature is too small to contain it.
next prev parent reply other threads:[~1998-12-03 14:56 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-03 14:00 William M. Perry
1998-12-03 14:26 ` Hrvoje Niksic
1998-12-03 14:37 ` Didier Verna
1998-12-03 14:44 ` Hrvoje Niksic
1998-12-03 14:54 ` Colin Rafferty
1998-12-03 16:08 ` Ken McGlothlen
1998-12-03 14:56 ` Bill White [this message]
1998-12-03 16:43 ` Wes Hardaker
1998-12-03 18:49 ` Matt Armstrong
1998-12-09 16:06 ` William M. Perry
1998-12-04 1:19 ` Laurent Martelli
1998-12-04 5:31 ` Felix Lee
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