Jekyll Picture Tag

Does anyone have any experience with ImageMagick? When I execute $ identify mypicture.jpg it outputs the following error: identify: no decode delegate for this image format "JPG" @ error/constitute.c/ReadImage/562.
So after running $ convert -list format indeed I noticed the missing jpg format. I guess my question is, whether it’s necessary or not to run ImageMagick from source, which is what I have done. Or to just install via apt? I’m not that sure how to completely uninstall the program when installed from source so before I try uninstalling and install via apt is there anything else I am missing?