ImageMagick no decode delegate

Question

I\'m trying to convert an image with imagemagick, but I\'m getting this error:

convert: no decode delegate for this image format `//i.imgur.com/nTheJ.

Answer 1

I had this error when rendering an image using DragonFly in Rails. This happened after I upgraded to Lion (ImageMagick was installed using Brew).

I reinstalled ImageMagick, jpeg, libtiff and jasper (reinstalling ImageMagick wasn't enough by itself).

brew uninstall imagemagick jpeg libtiff jasper
brew install imagemagick

Prior to that, running

identify -list format

and jpeg wasn't in the list. After reinstalling the above packages jpeg appeared in the list.