Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your TGA images to PGM format. This tool works for both professionals and casual users. Convert your images to PGM in seconds.
Truevision TGA (Targa)
The simple, reliable workhorse of video game textures.
TGA (Truevision Graphics Adapter), often called TARGA, is a raster graphics file format created in 1984. It was the first truecolor (24-bit) format for PC cards. Despite its age, it remains incredibly popular in the video game industry and broadcast graphics because it supports an alpha channel (32-bit images) and is extremely simple to parse.
A TGA file starts with an 18-byte header, followed by image identity information, optional color map, and then the pixel data. The pixel data can be raw or RLE compressed. The 32-bit version (RGBA) is particularly valued because the alpha channel is stored as a simple 4th byte per pixel, making it trivial for game engines to use.
Developed by Truevision for their TARGA and AT-Vista boards, which brought broadcast-quality video graphics to the IBM PC. It became the lingua franca of VGA graphics.
Portable Gray Map
The standard uncompressed grayscale format.
PGM (Portable Gray Map) is the grayscale member of the Netpbm format family. It sits between PBM (1-bit black and white) and PPM (full color). It is designed to store grayscale images where each pixel has a value ranging from black to white, with typical depths of 8-bit (0-255) or 16-bit (0-65535).
Like other Netpbm formats, PGM has two sub-formats: P2 (ASCII) and P5 (Binary). The header defines the dimensions and the maximum gray value (Maxval). In P2, pixel values are written as plain text numbers separated by spaces. In P5, they are raw bytes. It is strictly a single-channel format.
Created by Jef Poskanzer in the late 80s to handle scanned photos that were better than 1-bit bitmaps but didn't need full color. It became a staple in computer vision research and Unix tools.
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