What is the difference between .pt3 and .g4?
- Extension
 - .pt3
 - .g4
 
- Format
 - Binary
 - Binary
 
- Category
 - Font
 - Fax
 
- Developer
 - Adobe Systems
 - Computer Fax Systems (CFS)
 
- Description
 - PostScript Type 3 consists of glyphs defined using the full PostScript language, rather than just a subset. Because of this, a Type 3 font can do some things that Type 1 fonts cannot do, such as specify shading, color, and fill patterns.
 - 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.
 
- MIME Type
 - application/postscript
 - image/g4fax