Convert gif to ist Online: gif2ist

You can use Tom's Editor to easily convert images from
CompuServe Graphics Interchange Format .GIF to Interlace Studio .IST.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

GIF

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.

IST

Interlace Studio is an image format with extension IST.