If you right-click on the label "Inten" above the colorbar, a menu pops up -- the item "Save to PPM" will let you save an image of the colorbar to a PPM formatted file. You can then convert this to JPEG (say) with a command like
cjpeg -quality 90 zork.ppm > zork.jpg
The cjpeg program is included in the standard AFNI binaries and is also available on many Linux and Mac OS X systems.
bob cox