Working with Logarithmic Image Data

Logarithmic image data is a specialized color space that is used to encode scanned images stored in the Cineon format. This color space simulates how film negative responds to light. The response is logarithmic, so the color space is called logarithmic space.

Cineon files are the preferred file format for transferring film to video because of the way the file is stored using 10 bits per channel. This makes it possible to reproduce the full dynamic range of color in film.

The DPX file format is an extension of the Cineon format. Both are 10-bit formats with no compression. Cineon files support RGB channels only (no support for alpha or Z-depth information). DPX files usually are RGB only, but can support alpha. The main difference between the two is the ability to store additional information in the header of the DPX file.