Cineform Raw BMD Film Curve

[David_Newman]

Well then that curve is not the one used for ouput. It did look more like an encoding curve.

[iaremrsir]

Well then that curve is not the one used for ouput. It did look more like an encoding curve.

So does that mean that's the curve that should be used when the DNGs are imported into CF Studio?

[David_Newman]

So does that mean that's the curve that should be used when the DNGs are imported into CF Studio?

No, we are optimizing encoding curves to withstand compression, i.e maintaining a wide dynamic range with a 5:1 reduction of data.

[iaremrsir]

No, we are optimizing encoding curves to withstand compression, i.e maintaining a wide dynamic range with a 5:1 reduction of data.

Okay, that makes sense. This is kinda off topic from the main post but someone said that the Protune curve shows about 11 stops of dynamic range (can't remember where I read it). So why include "Optimize for 11 stops" in the options? Last question, is it possible to reverse engineer a curve from two shots - one in BMD Film and one in Rec. 709 - that are of reference charts?

[David_Newman]

There is only a slight difference between the "Optimize for 11 stops" and Protune, they are pretty much interchangeable.

Working out the curve will be straight forward once we have a camera. I don't know which it is you see with a BMD Film vs Rec. 709, also for those using a CineForm workflow the native of these particular curve shouldn't matter.

[Roman]

This is so cool... any progress made on an accurate curve that simulates BMD Film Log?

[iaremrsir]

This is so cool... any progress made on an accurate curve that simulates BMD Film Log?

Not that I know of. David said once they have the camera they should be able to derive the curve.

[Wuudi]

Ok I did some testing. And I got it pretty accurate.

I had to push the parameters around tough a little bit. And it seems to not read the metadata as Resolve does. I have one clip shot at ISO800 where
I had to push the exposure a lot, and another one at ISO200 where I had to move the exposure down again. The only difference is that BMDfilm
kinda pushes the blacks a little bit more. I couldnt get it to match perfectly because the lift control in GoPro-Studio is not so accurate. Everything else
matches tough just the blacks can/have to be lifted in Resolve.

The whitebalance tough is wayyyy different.

In Resolve for the DNG I have 5500 and tint 10. In GoPro Studio I have 6558 and -33.

Here are my settings (pushed gamma and lift around):2013-05-27_11h36_08.jpg


Attached you'll find an export from the flat image and graded with the default 709 LUT. gopro_1.3.1 Kopie.jpggopro_1.4.1 Kopie.jpggopro709_1.3.1 Kopie.jpggopro709_1.4.1 Kopie.jpg

[Wuudi]

Hmm the forum reduces the images.
Here are the full resolution JPEGS https://dl.dropboxusercontent.com/u/...ProBMDFilm.zip

[iaremrsir]

Bump. Updated to more accurate settings on front page.

[mtschudi]

Thanks, iaremrsir! So I guess David was never able to figure out the curve?

[iaremrsir]

Thanks, iaremrsir! So I guess David was never able to figure out the curve?

The reason it hasn't been added is because CF Studio is, how should I say... optimized for mathematical, logarithmic curves. BMD Film is not a mathematical log curve. Adding it would mean having to radically change the coding of the program.

[Jake Segraves]

COPY -> SELECT ALL -> PASTE

That should apply the curve to all of your clips.

You can also 'ADD' this as a PRESET to quickly apply it to newly converted files.
Nice job Iaremrsir!
Cheers!

[mtschudi]

I can't find "Ouput Curve" or "Cineon 95-685." Is it not in the Mac version, or am I missing something?

[iaremrsir]

I can't find "Ouput Curve" or "Cineon 95-685." Is it not in the Mac version, or am I missing something?

Mac doesn't do CinemaDNG raw yet