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If you want to create the noalpha versions of the preview graphics, run this:

mkdir noalpha
mkdir noalpha1
for f in $(ls *.png)
do
    convert ${f} -background \#333333 -flatten noalpha1/${f}
    convert noalpha1/${f} -fill \#FF00FF -opaque \#333333 noalpha/${f}
done
rm -rf noalpha1