Quote from: IDA_ML on July 19, 2021, 01:22:25 PM
Thank you, Levas. Could you please explain to me what 6:1 compression techniques are? Is this some kind of lossless RAW compression or is it something else?
It's about how much the data is compressed.
A video frame of 1920x1080x14bit = 29030400 bits, divided by 8 -> 3628800 bytes, divided by a million -> 3.628800 Megabyte.
So a non compressed 14 bit 1920x1080 frame is 3.6 Mbyte in size.
With 6:1 compression rate, your file size becomes 6 times smaller. (so instead of 3.6Mbyte it would become 0.6Mbyte)
In ML 14 bit raw is none compressed, so compression ratio is 1:1.
Then a few years ago, Alex found out about lossless LJ92 compression available in camera (The standard LJ92 compression, also used for lossless compression by adobe DNG converter).
This is a lossless compression which makes the filesize about 33% smaller, so ML lossless raw compression has actually a 1.5:1 compression ratio.
Other camera manufacturers of have options for 6:1 compression ratio, the 8K raw in the R5 is done with Canon cinema lite format which has an advertised compression ratio of 5:1.
Most of these are advertised as lossy compression formats and not lossless...but how the compression is done is in most cases kept a mystery by the manufacturers.
But there should be definately some color/detail loss along the way.