- Extension
- .g4
- .psb
- Format
- Binary
- Binary
- Category
- Fax
- Raster Image
- Developer
- Computer Fax Systems (CFS)
- Adobe Systems
- 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.
- Format used for saving large Photoshop documents over 30,000 by 30,000 pixels in size; supports images up to 300,000 by 300,000 pixels; to enable .psb support, check the "Enable Large Document Format" within the File Handling pane of the Photoshop Preferences window
- MIME Type
- image/g4fax
- image/vnd.adobe.photoshop
