+# guess at depth, unless it's been set
+if [[ "$depth" = "" ]]; then
+ if [[ $( convert $file[0] -format "%k" info: || exit 1 ) == 2 ]]; then
+ depth=1;
+ else
+ depth=8
+ fi
+ if [[ $verbose == 1 ]]; then
+ echo "Depth guessed at $depth."
+ fi
+fi
+