Interstingly enough, I found the following on my machine (Vista, Core 2
Duo):
(r+g+b)^2/3^2 = 28 seconds
(r+g+b)*(r+g+b)/9.0 = 40 seconds
(r+g+b)^2/9.0 = 22 seconds
Ashton
From: "Ross Presser" <[EMAIL PROTECTED]>
To: "Ashton Peters" <[EMAIL PROTECTED]>
Subject: Re: [magick-users] Mathematical Cloud Composition
Date: Tue, 10 Jul 2007 09:21:37 -0400
Maybe trivial, but why wouldn't you use 9.0 instead of 3^2.0? -fx is
slow enough as it is; give it all the help you can. Likewise,
(r+g+b)*(r+g+b) might be a skosh faster than (r+g+b)^2.0.
On 7/9/07, Ashton Peters <[EMAIL PROTECTED]> wrote:
My previous message to this list was rejected, so I will try again :)
I went with David's suggestion, with a couple of minor modifications for
command-line syntax on Windows:
convert nz_day.jpg nz_clouds.jpg ( +clone -channel a -fx
"(r+g+b)^2.0/(3^2.0)" ) \
-delete 1 -composite nz_composite.jpg
This worked perfectly!
Regards,
Ashton
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