ruby - Rmagick gem unable to set format -


my environment 10.9.2 , seems unable load 

imagemagick/6.8.7-7/lib/imagemagick//modules-q16/coders/png.la

and comes when trying set format on image

thumb = magick::image.read("img.jpg").first  thumb.format = "png"

brew doctor suggested brew update no avail.

has experienced or knows why might happening?

thanks.

the last comment in related github issue seems recommend brewing source.

brew install imagemagick --build-from-source

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