urlrewrite images to codeigniter controller method gives page not found error - codeigniter

Question

I've a codeigniter site up and running with no issues. Now I need to rewrite some images to codeigniter controller/method.
This is my .htaccess file which works fine
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
RewriteCond $1 !^(index\.php|images|robots\.txt|css|docs|js|media|static|public)
RewriteRule ^(.*)$ /index.php?/$1 [L]
Now I need something like this to rewrite images to codeigniter. Rewrite not redirect
RewriteRule ^(media/somefolder/someimage.jpg)$ /some_controller/somemethod?param=value [L]
I added the following line (this is not codeigniter just a regular php file) just for testing to make sure RewriteRule works and it's working fine
RewriteRule ^(media/somefolder/someimage.jpg)$ public/myphpfile.php?ipath=$1 [L]
But if I try any of the following I get codeigniter's page not found error page.
RewriteRule ^(media/somefolder/someimage.jpg)$ /some_controller/somemethod/?ipath=$1 [L]
or
RewriteRule ^(media/somefolder/someimage.jpg)$ index.php?c=some_controller&m=somemethod&ipath=$1 [L]
What am i missing here?

Answer 1

To add exception to only a specific image
Add the media rule like this :
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
RewriteRule ^(media/somefolder/someimage.jpg)$ /index.php?/some_controller/somemethod/?ipath=$1 [L]
RewriteCond $1 !^(index\.php|images|robots\.txt|css|docs|js|media|static|public)
RewriteRule ^(.*)$ /index.php?/$1 [L]
To add exception to all images inside the media directory
Since you've filtered out to ignore the media directory on this rule :
RewriteCond $1 !^(index\.php|images|robots\.txt|css|docs|js|media|static|public)
In order to rewrite the media path to a controller instead of ignoring it, remove the media rule from it :
RewriteCond $1 !^(index\.php|images|robots\.txt|css|docs|js|static|public)
Add the media rule like this :
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
# removed the media form below rule
RewriteCond $1 !^(index\.php|images|robots\.txt|css|docs|js|static|public)
RewriteRule ^(media/somefolder/someimage.jpg)$ /index.php?/some_controller/somemethod/?ipath=$1 [L]
RewriteRule ^(.*)$ /index.php?/$1 [L]