In the OOP CMS I've been working on, Image objects store their raw
content in the DB, then the scale and view methods check an on-disk
cache to see if there is a cached version of the image which fits the
criteria (view = original, scale = scaled by maximum x, maximum y,
maximum longest dimension) and redirects to the apache-served copy,
or generates the appropriate image using PIL, then redirects.
Sharpening is applied to images below 75% (more sharpening the
smaller the image is). Line-art is beautiful with this scaling; real-
world images have not been tested yet.
This does appear to be the best solution I've found in terms of
flexibility and storage. Apache serving static files is a bonus.
E.g. gothcandy.com (a personal sample site using the CMS) has the
following in WebFaction's control panel:
Domains:
* gothcandy.com (www)
Applications:
* gothcandy (TurboGears 1.0)
* gothcandy_cache (Symbolic Link)
%(home)s/var/cache/turbocmf
* gothcandy_static (Symbolic Link)
%(home)s/webapps/gothcandy/gothcandy/static
Websites:
* gothcandy (None, www)
/: gothcandy
/static: gothcandy_static
/cache: gothcandy_cache
Bada bing. An example of an image being returned from the cache is
the following page:
http://gothcandy.com/alice/2006/12/20/2/in-lieu-of-a-real-post/
The embedded image URL:
/content/doodle-1.png/scale?x=680
becomes: /cache/00/00/06-6582032d68cbbb0cc978d0852541cf49.png
The full version of the image:
/content/doodle-1.png/view
becomes: /cache/00/00/06-1f9711cd362cf0c356dc835edb4f1204.png
Cleanup is easy, as the MD5 hash identifying the "arguments" are
prefixed with a recoverable ID. Feel free to play with the scaling,
e.g.:
* http://www.gothcandy.com/content/doodle-1.png/scale?xy=100
* http://www.gothcandy.com/content/doodle-1.png/scale?x=100
* http://www.gothcandy.com/content/doodle-1.png/scale?y=480
Matthew Bevan, Systems Administrator
Top Floor Computer Systems Ltd.
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