t do that...)</p>

<p>Aside from the variables defined below, there may be other temporary
variables added by individual modules. Temporary variables are identified by at
least one lower case letter in their name, and are deleted automatically before
reading or writing each new image.  Make, Model and CameraType are temporary
variables like this, but these three are special because they are initialized to
an empty string instead of being deleted at the start of processing for each
image, which allows them t