How can I convert an image to grayscale via the command line? [closed]

Question

Closed. This question is off-topic. It is not currently accepting answers.

---

Want to improve this question? Update the question so it's on-topic for Stack Overflow.

Closed 8 years ago.

Improve this question

How can I use sips, imagemagic, or another tool to convert an image to black and white (grayscale) via the command line?

Answer 1

If you have imagemagick installed,

convert source.jpg -colorspace Gray destination.jpg (true grayscale only)
convert source.jpg -monochrome destination.jpg (true black and white)
convert source.jpg -separate destination.jpg (separate into gray channels)

If you don't care about losing the original file: mogrify -colorspace Gray file.

Answer 2

use one of: -monochrome or -colorspace gray options for imagemagick (convert).