Support ProVideo Coalition
Shop with Filmtools Logo

What Do You Think? Let Us Know.

Notify of
1 Comment
Newest Most Voted
Inline Feedbacks
View all comments
Jack Hogan

Hello Art, interesting article with lots of good information explained in an easy to follow way, thanks!

One small correction. The rationale for log-gamma encoding is to save space/bandwidth/power, not because linear data looks inherently ‘too dark’.

Linear data is just right because that’s what the Human Visual System expects to see. Think of watching the scene through a window, then cover the window with a monitor showing a capture of the same scene: ideally they should produce the same natural signal to the eye, i.e. linear. The HVS then responds to the linear signal as it always does, non-linearly. Which is why log-gamma compression is possibly perceptually transparent, if properly done (by the encoder) and undone (by the monitor). With benefits in space/bandwidth/power in between (e.g. file size or HDMI cable max bit rate).

You Might Also Like