URL rewrite image links

I have third party sites that link to some images on my site. The images were placed in Magento's image cache some time ago. But when the cache is refreshed, Magento modifies the file names and thus the links become unreachable. It is not every image just certain ones that this is happening to.

How can I modify my .htaccess to make the links go to a static copy of the image located in another directory?
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Eddie ShipmanAll-around developerAsked:
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Steve BinkCommented:
Something like this:

RewriteRule ^/?path/to/cache/(.+\.(png|jpg|gif))$ /path/to/static/$1 [NC]

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You could also use a RewriteCond directive to isolate the referer.  If this is happening to several files, you might consider using a RewriteMap configuration for manageability.
Eddie ShipmanAll-around developerAuthor Commented:
I only want a certain 22 files redirected, the above does for all files in that path.
How would I use this RewriteMap?
Steve BinkCommented:
See the docs here:

http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html#rewritemap

RewriteMap is less than optimal for many people because it requires access to the server's conf files.  The map itself can be used in .htaccess, but it must be defined at the server/vhost level.  If you cannot use a RewriteMap configuration, your other alternative is to write rules for each file individually:

RewriteRule ^/?path/to/cache/image1\.png$ /path/to/static/image1.png [NC]
RewriteRule ^/?path/to/cache/image2\.png$ /path/to/static/image2.png [NC]
RewriteRule ^/?path/to/cache/imagen\.png$ /path/to/static/imagen.png [NC]

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Eddie ShipmanAll-around developerAuthor Commented:
Actually ended up using redirect for all 23, thanks.
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