Take screenshots suitably scaled for use in Ubuntu Ubiquity slideshows.

slide-shot.sh

#!/usr/bin/env bash

# Grab a screen shot of a window correct scaled for use in the
# Ubuntu Ubiquity slide shows.
RES_X=896
RES_Y=702

# Get the window we want to resize
TMP_XWININFO=$(mktemp -u)
echo -e "Please select the window you\nwould like to screenshot by clicking the\nmouse in that window."
xwininfo | tee ${TMP_XWININFO} > /dev/null
WINDOW_ID=$(grep "Window id:" ${TMP_XWININFO} | head -n1 | cut -d':' -f3 | cut -d' ' -f2)
rm -f ${TMP_XWININFO}

echo "Resizing: ${WINDOW_ID} to ${RES_X}x${RES_Y}"
# Set the resolution
wmctrl -i -r ${WINDOW_ID} -e 0,0,0,${RES_X},${RES_Y}
# Raise the window
wmctrl -i -R ${WINDOW_ID}
if [ -e $(which gnome-screenshot) ]; then
  gnome-screenshot --window --delay=1 -f ${HOME}/slide-shot.png
  if [ -e $(which convert) ]; then
    convert -resize 50% ${HOME}/slide-shot.png ${HOME}/slide-shot-small.png
  fi
else
  echo "WARNING! No supported screenshot tool found."
fi