.htaccess if directive

in .htaccess I have something like this:

RewriteCond %{REQUEST_URI} (\/out\/pictures\/)
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule (\.jpg|\.gif|\.png)$ core/utils/getimg.php
 

I want to change it to

RewriteCond %{REQUEST_URI} (\/out\/pictures\/)
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 if url == www.mysite.com {
   RewriteRule (\.jpg|\.gif|\.png)$ core/utils/getimg.php
 } else {
   RewriteRule (\.jpg|\.gif|\.png)$ core/utils/getimg1.php
 }
 

Is it possible in some way?

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