Screen captures in Unix/Linux

There are several tools around for screen caps in Unix/Linux.

First option:
GNOME users: Use the built-in tool to take a screen shot. You don't need to go as far to launch it. A PrintScreen to take a screenshot of the desktop is enough. Want only a window? Get the window into focus and hit Alt+PrintScreen.

KDE users: ksnapshot is pretty impressive. It too can take images of the desktop or window.

Second option (in order of preference):
gimp: GIMP can take screenshots - gimp1 seems to dither on Solaris 8 tho'. At least on the installation I worked with it didn't work too well. It still worked a lot better than Solaris's own sdtimage.

xv: A fast image viewer - it can also take screenshots. :) The reason it is second in preference is it is shareware - it may not readily be available on the machine.

stdimage: This tool is available on Solaris only. Not too impressive - kept crashing in Solaris 8 :(

Last option: Use the command line. My favorite in order of preference:
import: Part of ImageMagick's impressive suite.

xwd and convert: xwd can capture X-Window dumps but the format is not understood by most image viewers. ImageMagick's convert however can convert these files into a gif/jpeg/whatever else.

There probably are other means too, but I'm not really aware of any other than the tools mentioned above.