Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I want to do something like

mogrify -format jpg *.png

However, I want to encode the jpg at a higher quality than the default. Is there a way to do this?

share|improve this question
up vote 14 down vote accepted
mogrify -format jpg -quality 100 *.png

According to the official documentation the quality parameter can be 1 - 100 and the effect varies depending on the resulting format.

  • For JPG output a value of 1 gives worst quality and highest compression; a value of 100 gives best quality and lowest compression.
  • For PNG files the quality parameter only changes the lossless compression strategies used, so the speed of compression and the resulting file size can be affected but image quality remains the same.

With any Linux command, you can enter

man [command]

To see the help page that list out the information and parameters available.

share|improve this answer
Almost any Linux command. – Nathaniel Dec 5 '09 at 21:34

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.