ImageMagick convert: UnrecognizedMorphologyMethod

Question

I saw in documentation of Imagemagick this command:

convert qc.gif -morphology Thinning:-1 Skeleton qc2.gif

But echo this error:

convert: UnrecognizedMorphologyMethod `Thinning' @ error/convert.c/ConvertImageCommand/1957.

But when I list the commands avaliable (convert -list command) it shows:

+morphology
-morphology

Answer 1

I updated Imagemagick to 6.6.9-1 version and now it works.