Magick should not throw SameType error

[sashee]

• [x] This feature is not on the latest version

Request

I have a bunch of images and I want to make sure they are displayed as JPGs. The formats differ, some are PNGs some are JPGs. If I use magick:format then a SameType error is raised for the JPGs.

It would be better to either

• let ImageMagick handle this case
• or just ignore the format option when the target format is the same as the image