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Rubygem
Description: A lightweight and flexible website management system.
Homepage: http://webby.rubyforge.org/
Clone URL: git://github.com/TwP/webby.git 
Fixing the TeX to image conversion routine so that it works with 
ImageMagick 6.4  Something broke with the 6.4 release, and so I had to 
futz with the convert command till I got it working again. I have no idea 
if this is backwards compatible with ImageMagick 6.3
Tim Pease (author)
Thu Jul 31 09:42:33 -0700 2008
commit  43fc5dc973a83b68d8119c90cd9f79759aeb09ce
tree    d62924acaa5fc0ade2e8b8bde0b530ab5745c319
parent  4f0397be3cdd6416317332cbde5ae41325935b91
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lib/webby/helpers/tex_img_helper.rb 
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@@ -97,10 +97,9 @@ module TexImgHelper
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       %x[pdflatex -interaction=batchmode out.tex &> #{dev_null}]
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       convert =  "\\( -density #{res} out.pdf -trim +repage \\) "
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-      convert << "\\( +clone -fuzz 100% -fill #{fg} -opaque black \\) "
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-      convert << "+swap -compose copy-opacity -composite "
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-      convert << "\\( +clone -fuzz 100% -fill #{bg} -opaque white +matte \\) "
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-      convert << "+swap -compose over -composite #{out_file}"
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+      convert << "\\( -clone 0 -negate -background #{fg} -channel A -combine \\) "
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+      convert << "\\( -clone 0 -background #{bg} -channel A -combine \\) "
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+      convert << "-delete 0 -compose dst-over -composite #{out_file}"
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       %x[convert #{convert} &> #{dev_null}]
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     ensure
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       Dir.chdir(pwd)
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@@ -126,8 +125,8 @@ end  # module TexImgHelper
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 %x[pdflatex --version 2>&1]
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 if 0 == $?.exitstatus
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-  %x[convert --version 2>&1]
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-  if 0 == $?.exitstatus
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+  %x[convert --help 2>&1]
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+  if (0..1).include?($?.exitstatus)
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     register(TexImgHelper)
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   end
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 end

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