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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.

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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

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