I have a site on a dedicated server and it’s not capable of handling .tif images types without adding a handler to the .htaccess file. I don’t know much about it and used:
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !.(png|gif|ico|swf|jpe?g|js|css)$
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php?sef_rewrite=1 [L,QSA]
RewriteCond %{REQUEST_FILENAME} ./catalog/.
RewriteCond %{REQUEST_FILENAME} -d
RewriteCond %{REQUEST_FILENAME}/index.html !-f
RewriteRule . index.php?sef_rewrite=1 [L,QSA]
AddHandler image/tiff tif tiff
Have you tried this:
AddType image/tiff .tiff .tif
Resource here: [URL]http://www.mike.eclipse.co.uk/htaccess/[/URL]
Good luck!