ImageMagick is generally considered the de facto standard. To date, he has been attached to so many languages โโthat he does not even need to be bothered. Ruby binding is apparently called rmagick.
However, you can, of course, load and display the SVG yourself, perhaps with ruby โโbindings for librsvg (never used this successfully), and using ruby-libpng to store it as png.
What is a RoR app?
falstro
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