-
Again clouded
Hello,
I thaught I understood something about 16-235 and 0-255 in DaVinci, but again, I’m lost.
I have to grade a feature.
I work with my DILA Rs35 in Rec709, and in legally scaled mode in DaVinci. Then black is at 16 and white at 235. I have to do a 35mm print and a DCP.
What append when I render in DPX from DaVinci. Will DPX be also legally scaled ? Or black will be at 0 and white at 255 ?
In my mind it’s black at 0 and white at 255, but I have a doubt since this week-end : I made a DCP with easyDCP and my black seemed to high (the DCI projector is to bright because the white is at 25Ftl…) but to be sure I would like to know if DPX output from DaVinci are really between 0-255.
Sorry for this question, as colorist I should know that.
Robin
réalisateur, scénariste, monteur
http://www.robinerard.ch -
5 Replies
-
The “Normally scaled legal video” selection in the video monitoring will only apply to your monitoring… and Resolve will render the full-range values that it works with internally when you render to DPX.
You can apply the same scaling with an output LUT, as an output LUT it will apply to the monitoring and renders (you’ll have to switch to “unscaled full-range” monitoring to avoid doubling up). I’m not very confident in the Resolve’s included “DataToVideoScale” LUT, I created my own and use the hardware scopes to confirm that I get the same values with LUT/unscaled as No LUT/scaled.
I don’t know anything about EasyDCP though, I’m curious what formats you put in and how are you playing back a finished DCP?
KC
prehistoricdigital.com
hardworkingpixels.com -
Hello,
Thank’s for this very good answer.
easyDCP is.. incredible but a little bit expensive. https://www.easy-dcp.de
It’s a german software which generate DCP from A to Z with a very simple interface. The flow is this one :
DPX in Rec709 -> easyDCP (converts from Rec709 to xyz) -> add sound -> add subtitle -> Generate
it take about twice the time to creat a DCP (a short of 30min is about 1hour to generate the DCP)…
You can work with 2K or 4K DPX, 2D or 3D. InteropMXF (24fps – 48fps) or smpte (24-25-30-60).
To playing back… that’s the problem. You can buy an other software easyDCP player but it’s expensive… I prefer to go to a D-Cinema to check it.
All the best
Robin
réalisateur, scénariste, monteur
http://www.robinerard.ch -
[Robin Erard] “In my mind it’s black at 0 and white at 255, but I have a doubt since this week-end : I made a DCP with easyDCP and my black seemed to high (the DCI projector is to bright because the white is at 25Ftl…) but to be sure I would like to know if DPX output from DaVinci are really between 0-255.”
If you’re really quoting 0-255, you’re working in 8-bit, which is a very severely compromise for DCI.
You can choose your scaling in Apple COLOR, but Resolves’s default is dpx, and it looks like its default is to scale for Rec709 monitors, it should be 64-940.
check the manual:
The Colorspace conversion selection will perform a color mapping conversion to work with data to
video level translations. Remember your images are often stored in full 0-1023 data but the monitor is
generally expecting, and can process, the 64-940/960 video levels as specified by SMPTE. If you wish
to monitor the full 10-bit data range (0- 1023) of the monitoring output, simply change the colorspace
conversion to unscaled full range data. If the Colorspace conversion is set to the normally scaled legal
video then the data range is scaled down to video range (64-940/960).jPo
You mean “Old Ben”? Ben Kenobi?
-
Ah, good to have a friend with a movie theater… I like the idea of monitoring DCI colors in 2K and delivering DCPs… At that point I would perhaps need a server and 7.1 surround to check the packaging…
Looks like easyDCP has a lot of new versions and new features… and I do like that all these programs are creating Mac versions…
KC
prehistoricdigital.com
hardworkingpixels.com -
Hello,
No, no. I’m grading in 10bit then it’s 64-940 (like 16-235 in 8bit). And my DCPs are good 😉
The flow is this one if I’m not wrong :
rushes in 10bit 0-1023 -> DaVinci legally scaled -> monitoring in 64-940 Rec709 -> color grading -> output DPX in 0-1023
About the DCI cinema, yes I’m lucky to have a D-cinema to test it it’s not in 7.1, only in 5.1… but enough for what I did until now. In Switzerland the State is helping movie Theater to pay the D-cinema installation. It’s about 130’000 dollars per cinema, and State is giving about 100’000 per cinema.
All the best
Robin
réalisateur, scénariste, monteur
http://www.robinerard.ch
Reply to this Discussion! Login or Sign Up