[magick-users] Mathematical Cloud Composition

[Ashton Peters]

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" <rpresser at gmail.com>
>To: "Ashton Peters" <ashtonaut at hotmail.com>
>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 <ashtonaut at hotmail.com> 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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