The program XWD ( X Windows dump ) that runs in the X Window System captures the content of a screen ( screenshot / Screen dump) and saves it into an uncompressed bitmap image. Since it’s an uncompressed image the file size may be very large. The X11 xwd is supported by various image viewsers like XnView, GIMP, ImageMagick and others.
See the XWD manual for more information.
MIME TYPE’s: application/x-xwd, image/x-xwindowdump, image/xwd, image/x-xwd, application/xwd, .