Convert gif to sgi Online: gif2sgi
You can use Tom's Editor to easily convert images from
CompuServe Graphics Interchange Format .GIF to Silicon Graphics RGB .SGI.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
GIF images were created by Compuserve. They can used no more than 256 colors and a single color transparenty (no Alpha channel). Today are rare since they offer low quality and huge filesizes. GIF animations are still in use.
Silicon Graphics RGB is an image format with extension SGI.