With this plugin text can be pasted as a picture in an article or page to protect mailaddresses or postaddresse against automated crawler.
You can call the method / function:
de\flashpixx\imagetext\link::get( "latex | text | qrcode", "your content" )
The method returns a string with the full image tag. The third parameter is optional and can be an associative array with options. The option names are shown in the administration interface
Take a look on the administration page of the plugin. Within the brackets  you can find the option name, that can be passed to the imtxt-tag or as an associative array to the method / function call
No you can not do this, because the image is created dynamically and a session value is passed to the image generation function. You need the session value, that is unique within the browser session and you need also read access to the session. The session can read only by the webserver (virtual host). So you can not pass any images between different domains or static pages.