- Extension
- .g4
- .rb
- Format
- Binary
- Text
- Category
- Fax
- Ebook
- Developer
- Computer Fax Systems (CFS)
- NuvoMedia
- Description
- Group 4 (G4) used for black and white lossless compression to maintain high-quality images, commonly used in TIFF format compression by fax machines. A picture is seen as black dots and lines on a blank page; the fewer the dots and lines are, the lesser the file size.
- RB is an eBook file format that was developed by NuvoMedia. It was first used in Nuvo Media’s Rocket eBook device. It contains the contents of the book in HTML form.
- MIME Type
- image/g4fax
- application/x-rocketebook
