Apache redirect direct linked images...

don’t direct link images .. bad things happen

RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http[s]?://(www\.)?yoururl\.com/.*$ [NC]
RewriteRule \.(gif|jpg|jpeg|bmp)$ redirected_image.jpg [L]

- credit fif3