Unlike standard RGB images with their three channels, these files store information across numerous channels, each ...

See DNG image format. Because the format processing is ... using a RAW editor before the sensor data are turned into RGB pixels. Even the exposure can be altered with better results.

[Dominic Szablewski] was tinkering around with compressing RGB images, when he stumbled upon idea of how to make a simple lossless compression algorithm, resulting in the Quite OK Image Format ...