[magick-users] modulate (animate brightness)

[Anthony Thyssen]

Fred Weinhaus on  wrote...
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| P.S.
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| You can use  -evaluate multiply 0.5 or  +level 0,50%  (note the + 
| sign)  in place of -modulate 50%
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I would not trust -modulate at this time.

My tests show that it is NOT linear!

   -modulate 100%      no change
   -modulate 200%      should be all white - it isn't
   -modulate 900%      still not quite all white!

  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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        ``Sorry 'bout that Chief!''
        ``Missed it, by that much!''          -- Get Smart
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/