Dec 05, 2018 If your PGM file is related to a piece of hardware on your computer, you might need to update your device drivers associated with that hardware in order to open it. This problem is commonly related to multimedia file types that depend upon a piece of hardware inside of your computer to be successfully opened, such as a sound card or graphics card. Windows can't open this file: File: example.pgm To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.
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The PGM is the Portable Gray Map. If we want to store a 2d array in C as images in PNG, JPEG, or any other image format, we have to do lots of work to encode the data in some specified format before writing into a file.
The Netpbm format gives an easy and portable solution. The Netpbm is an open source package of graphics program and it is used basically in linux or Unix platform. It also works under Microsoft Windows systems.
Each file starts with a two-byte magic number. This magic number is used to identify the type of the file. The types are PBM, PGM, PPM etc. It also identifies the encoding (ASCII or Binary). The magic number is a capital P followed by a single digit number.
The ASCII encoding allows human readability and easy transfer to other platforms; the binary format is more efficient in file size but it may have native byte-order issues.
How to write PGM files?
- Set the magic number P2
- Add whitespace (Space, Tabs, CRs, LFs)
- Add width, formatted as ASCII character in decimal
- Add Whitespace
- Add height, formatted as ASCII character in decimal
- Add Whitespace
- Put the maximum gray value, again in ASCII decimal
- Add Whitespace
- Width x Height gray values, each in ASCII decimal (Range between 0 and maximum value), separated by whitespace from top to bottom.
Example Code
The PGM image is looking like below
Output
Author: Jay Geater | Last Updated: December 05, 2018
PGM File Summary
Our most recent information indicates that PGM files are associated with only a single known file type, the Portable Gray Map Image format, and can be viewed primarily with Adobe Photoshop, including four other known software applications (listed below). Generally, these files are considered Raster Image Files.
The PGM File Extension can be viewed on the Windows, Mac, and Linux operating systems. They are supported on both desktop and mobile devices. The main PGM file type has a Popularity Rating of 'Low', meaning these files are not frequently present on your typical desktop or mobile device.
Interested to learn more about the PGM File Extension? We encourage you to view the detailed file information below to learn about the software that opens PGM files, and other troubleshooting tips.
File Type Popularity
Can Windows Open Pgm Files
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