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How to Download and Use PGM Files
PGM files are a type of image file that store grayscale 2D images. They are simple, compatible, and flexible, but they have no color information. In this article, you will learn what PGM files are, how to download them, and how to use them for various purposes.
What is a PGM file
PGM stands for Portable Gray Map, and it is one of the formats of the Netpbm project, which defines a set of image formats for portable graphics. A PGM file contains a single image that is easy to write programs for and to edit. The file consists of a header and a body. The header has a magic number (P2 for ASCII or P5 for binary), the width and height of the image in pixels, and the maximum gray value (from 0 to 65535). The body has the gray values of each pixel, separated by whitespace in ASCII or by bytes in binary. A value of 0 means black, and the maximum value means white. Here is an example of an ASCII PGM file:
P2
# feep.ascii.pgm
24 7
15
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 3 3 3 3 0 0 7 7 7 7 0 0 11 11 11 11 0 0 15 15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
The image looks like this:
How to download PGM files
There are many sources of PGM files on the internet, such as online galleries, repositories, or tutorials. You can also create your own PGM files using image editing programs, such as Adobe Photoshop or GIMP, or using programming languages, such as C or Python. To download a PGM file from a website, you can follow these steps:
Find the URL of the PGM file you want to download. You can usually right-click on the image and select \"Copy image address\" or \"Copy link address\".
Paste the URL into your browser's address bar and press Enter.
The browser will display the PGM file as plain text or as a binary file. You can right-click on the page and select \"Save as\" or \"Save page as\".
Choose a location on your computer where you want to save the file and give it a name with the .pgm extension.
Click \"Save\" and wait for the download to finish.
How to use PGM files
PGM files have many uses for artists, designers, programmers, and students. Here are some examples of how you can use them:
Black and white photography and art. You can store and share beautiful photographs and art projects in PGM files. They are ideal for creating a grainy, low-fi, or abstract effect.
Learning to program. PGM files are one of the building blocks of computer programming. Many new and student programmers begin by studying PGM files and learning how to code, manipulate, and use them in various situations.
Logos, charts, diagrams, cut-outs, and maps. PGM files are ideal for simple graphics and illustrations. You can use them in sets, pared-back in color and scale, and stacked up in layers. They are perfect for stark black and white symbols and graphics.
To open a PGM file on your computer, you will need a compatible program that can read and display it. Some common programs that can open PGM files are:
ProgramPlatform
Adobe PhotoshopWindows, Mac aa16f39245