.PGM File

File extension pgm is used for Portable Graymap file format.

PBMPlus files are created by Jef Poskanzer's PBMPlus Portable bitmap utilities. The portable graymap format is a lowest common denominator grayscale file format.

MIME types:
image/x-portable-graymap
image/x-portable-bitmap
image/x-portable-pixmap
image/x-portable-anymap
image/x-pgm
 

Files with pgm file extension might be mostly founds as images in Portable Graymap file format.

How to open:

Use XnView or Adobe Photoshop to view *.pgm files.

How to convert:

Use Adobe Photoshop or OpenOffice.org Draw.