Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
$ convert img_9812.cr2 test.jpg
convert: incorrect count for field "BitsPerSample" (3, expecting 1); tag trimmed. `img_9812.cr2'.
convert: img_9812.cr2: unknown field with tag 40961 (0xa001) encountered. `TIFFReadCustomDirectory'.
convert: img_9812.cr2: unknown field with tag 40965 (0xa005) encountered. `TIFFReadCustomDirectory'.
convert: incorrect count for field "BitsPerSample" (3, expecting 1); tag trimmed. `img_9812.cr2'.
convert: compression not supported `img_9812.cr2'.
convert: missing an image filename `test.jpg'.
this happens with imagemagick-6.4.4-1 (and certainly 6.4.3-5, too).
last known working version is 6.4.0-6.
Adding the cr2: prefix is fine for a single, manual convert operation. But for an automatic, script-based image-processing application this is not a solution. And in previous versions, IM had no problem autodetecting the cr2 or nef image types.