.Most popular Graphics file extensions:
.pub - Microsoft Publisher document
.cdr - CorelDRAW vector image
.eps - Adobe Illustrator text and graphics (Encapsulated PostScript)
.indd - Adobe Indesign document
.mdi - Microsoft Office Document Imaging file format
.psd - Adobe Photoshop graphics
.ps - Adobe PostScript file
.psb - Photoshop's Large Document Format
file extension GP4 - CCITT Group 4 file
File extension GP4 description:
Comité Consultatif International Téléphonique et Télégraphique, an organization that sets international communications standards. CCITT, now known as ITU (the parent organization) has defined many important standards for data communications.
A protocol for sending fax documents over ISDN networks. The Group 400 protocol supports images of up to 400 dpi resolution.