+ PAGESDIRECTORY
+ name of the directory in which to put the pages for fullsized and
+ mediumsized images. Defaults to the image directory. This is
+ relative to the images directory, so, for example,
+ PAGESDIRECTORY=pages would create /path/to/image/files/pages
+
+ MEDIUMDIRECTORY
+ directory to generate medium sized images in, defaults to medium,
+ works the same as the PAGESDIRECTORY variable
+
+ ICONSDIRECTORY
+ directory to generate thumbnails in, defaults to icons, works the
+ same as MEDIUMDIRECTORY and PAGESDIRECTORY
+