gistfile1.txt

ruby bench_negate.rb
performing 30 iterations...
Rehearsal -------------------------------------------
Devil     0.110000   0.090000   0.200000 (  0.264404)
RMagick   0.250000   0.230000   0.480000 (  0.598489)
---------------------------------- total: 0.680000sec

              user     system      total        real
Devil     0.090000   0.080000   0.170000 (  0.244527)

gistfile2.rb

require 'rubygems'
require 'benchmark'
require 'RMagick'
require 'devil'

N = 30
puts "performing #{N} iterations..."

@dimg = Devil.load("texture.png")
@rimg = Magick::Image.read("texture.png").first

Benchmark.bmbm do |x|
    x.report("Devil") {
        
        N.times { 
            @dimg.dup.negative
        }
    }

    x.report("RMagick") {
        
        N.times { 
            @rimg.negate
        }
    }
end