Setting Image FileName to FTP vs HTTP

[Tariel Gogoberidze]

Hi,

Setting the image FileName to

ftp://User:Pass@DomainName.com:21/folderName/ImageName.jpg

is working in my tests, but may be somebody knows, is it OK to use  
FTP to set  image FileName and if yes,  is there a difference in load  
speed, reliability etc between setting image FileName to FTP as  
opposed to "normal"
http://DomainName.com/FolderName/ImageName.jpg

Thanks in advance for tips
Tariel