MacOS – How to open or convert .xwd image dump

file conversiongraphicsmacosscreen capture

I did the image dump of an X window by using /opt/X11/bin/xwd, e.g.:

xwd -root -silent > screen.xwd

Now, how do I open this file or convert into JPEG file?

Probably I could use pnmtojpeg, but it seems it is not available in Homebrew.

Alternatively use ImageMagick which support jpeg, png and other popular formats, example usage:

import -window root screen.jpeg

^{Install by brew install imagemagick --with-x11}