slashCAM Forum

wolfgang hat geschrieben: ↑Mi 31 Mai, 2017 22:12 Ob der ewig ignorante Kerl eigentlich weiss was der Unterschied zwischen 12 bit linear raw und 16bit raw ist? Und was das bedeutet? Aber er spricht lieber über wording Fragen.
http://www.dvinfo.net/forum/sony-xdcam- ... s-log.html

dienstag_01 hat geschrieben: ↑Mi 31 Mai, 2017 22:37 Raw ist kein Log. *Wording* hin oder her ;)

From the outset Sony have not hidden the fact that the raw is 12 bit. Perhaps a little more homework should have been done to fully undersatnd the implications of this.

The 12 bit raw will deliver the full latitude of the camera. Plus there is around the same amount of data in the shadows excepting perhaps the first two or three stops as you would find with S-log. Frankly the lower stops are going to be pretty noisy anyway so anything in those stops is never going to look great. You have a lot, lot more data in the highlights. So what you need to do is adjust the way you shoot and deliberately over expose your shots to pull the scene data further up the recording range. I would aim for 1.5 to 2 stops of deliberate over exposure. This is best practice with linear raw with any camera. It's worth remembering that the with linear the top stop contains double the brightness range of the previous stop and as much data as the rest of the entire recording range, so there is a lot of very usable data in those highlights. So push it hard and get the best results. Don't over protect highlights, let them go in to clipping a little.

Of course if the scene isn't bright enough to do this, well then you will need to add light, but that also applies to log, if there isn't enough light the footage will be noisy anyway.

I very much doubt we will ever see log raw in this camera. It's very easy to pass the linear data from the sensor to the raw output but much harder to encode it as a log signal first. While log raw may bring benefits to the shadows it will restrict the amount of data in the highlights forcing the use of lower exposures which will mean noisier images that may not grade as well. I really don't think there would be much benefit to having 12 bit log raw over 10 bit S-log. As with all these things there are always trade-offs, especially when you only have a limited data bucket.

Wolfgang hat geschrieben:Und im Übrigen wurde nicht raw und log gleich gesetzt, sondern von "log raw" gesprochen. DAS ist ein Unterschied und dieser terminus technicus findet sich durchaus in Diskussionen:

wolfgang hat geschrieben: ↑Fr 02 Jun, 2017 19:27 Nochmal zum Mitstottern: weißt du was das Limit von 12 bit raw ist???? DAS IST DER PUNKT. Wenn du das noch immer nicht weißt, dann informiere dich endlich.