[Radiant] Caching + gallery_behavior

[J Coppedge]

I've been using the gallery_behavior for a simple directory/file based
gallery.  Works well - but have a couple of questions that others may have
already experienced...

1. Is there a way to control the image caching separately from the rest of
the site?  The default cache is 5 minutes and is quite short for an image
gallery that has to generate the thumbnails on the fly.  Just causes
overhead and slowdowns.  The temporary fix I have in place is to do longer
sitewide cache - however not ideal for other parts of the site.

2. The auto resized images and thumbnails that are generated seem larger the
expected, is there a quality switch to reduce the quality when resizing?  A
80x60 thumbnail shouldn't be 20 KB, should it?  Is the option to just change
the thumbnails to GIFs versus PNG?
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