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BMPCC Raw (DNG) and bit-depth

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mark thompsonBMPCC Raw (DNG) and bit-depth
by on Feb 11, 2016 at 10:40:49 am

Hi, I have a bit of a puzzle at the moment. I have some Raw (DNG) footage from a BMPCC that I need to color correct and I'm a bit unsure of the workflow.
When I open a DNG in Camera Raw (9.4), at the bottom it says it is an 8 bit image. When I put that footage into After Effects and export a frame - it comes out as 48 bit and Photoshop reports this is a 16 bit image (I assume 48 bit is 3 x 16bit).
I have installed the Adobe driver and windows reports each DNG is 48 bit.
I was expecting 10 bit Raw. But what do I have?
Is it really an 8 bit image? An 8 bit image mapped into a 16 bit image? A 10 bit image mapped into 16 bits (i.e. preserving all 10 bits of the Raw color).

How do you tell how much real color is in the image?

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Chris WrightRe: BMPCC Raw (DNG) and bit-depth
by on Feb 11, 2016 at 11:28:56 pm

if you export, you lose RAW unless you render out 32bpc or cineon log.
adobe's ACR is where you decide how to interpet the colors, etc.

Shooting Resolutions
Apple ProRes 422 HQ 10 bit Film log or Video(Rec. 709)
CinemaDNG RAW. 1920 x 1080 Dynamic Range is 12 bit. log only

DNG is encoded in log. interpret the color as bmd film lut.

download link here to set your RAW images and videos to BMDFilm lut

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mark thompsonRe: BMPCC Raw (DNG) and bit-depth
by on Feb 12, 2016 at 10:16:42 pm

thanks very much for that.

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Chris WrightRe: BMPCC Raw (DNG) and bit-depth
by on Feb 14, 2016 at 4:18:27 pm
Last Edited By Chris Wright on Feb 14, 2016 at 5:26:06 pm

I thought i might add, if you really, really want to render dng, you can open a Premiere Pro sequence containing After Effects Compositions directly in SpeedGrade. SpeedGrade opens the sequence in Direct-Link mode, from where you can color grade the compositions just as you would color grade any Premiere Pro sequence. and then from there, speedgrade can render out dng image sequences!

but that requires a lot of ram, cpu. it's easier to render out a cineon although the file size is 3x. That's why initial conforms are so important, they save hd space.

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