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 PNG24 images to PGM format. This tool works for both professionals and casual users. Convert your images to PGM in seconds.
PNG-24 (24-bit RGB)
The standard for opaque, true-color lossless images on the web.
PNG-24 is the standard version of the PNG format for opaque, full-color images. It supports 24-bit color depth, which allows for over 16 million distinct colors (True Color)—the same color range as a standard JPEG. Unlike JPEG, however, PNG-24 uses lossless compression. This means it preserves every single pixel exactly as it was created, with absolutely no blurring or artifacts. This makes PNG-24 the ideal choice for complex graphics, screenshots, and detailed diagrams where quality is paramount and transparency is not needed. Note that while 'PNG-24' is often used to refer to any true-color PNG, strictly speaking, it refers to the RGB variant without an alpha channel. If you need transparency, you are technically using PNG-32 (RGB + Alpha).
A PNG-24 image consists of three color channels: Red, Green, and Blue. Each channel uses 8 bits of data per pixel, resulting in 24 bits total (8+8+8). This allows for 256 levels of intensity for each primary color, combining to produce 16,777,216 possible colors. Because it lacks an alpha channel, every pixel in a PNG-24 file is fully opaque. While the PNG specification allows for a 'tRNS' chunk to define a single specific color as transparent (similar to GIF), this is rarely used in modern web design in favor of the full alpha transparency found in PNG-32.
PNG-24 was part of the original PNG 1.0 specification released in 1996. It was designed as a direct, patent-free competitor to JPEG for lossless image storage. While JPEG won the war for photographs due to its superior compression ratios, PNG-24 became the standard for screenshots, diagrams, and digital art where preserving exact pixel values was more important than file size.
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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