Blackmagic Forum

Hello all,

I'm currently working on a project. Shot on colour 35mm film, scanned to 2K ProRes(HQ), graded to black and white in Resolve.

ProRes outputs from Resolve look great. As expected and as is seen in the Resolve viewer.

h.264 outputs however have a nasty green colour cast. Bear in mind this a black and white piece, so the colour shift is very obvious. I want to use the h.264 outputs to quickly generate shareable files without having to go through another transcoding app.

Below are links to the exported files being previewed back within Resolve (to avoid any quicktime gamma/colour issues).

ProRes


h.264


Tried various permutations of the h.264 and mpeg4 output settings, but to no avail.

My setup is a 27" iMac (late 2012) running Resolve Lite 9.1.6.

Any help would be much appreciated. I know h.264 encoders have their issues (personally I love using x.264), but can I really not get a simple, clean, black and white h.264 image out of Resolve?!

Thanks,

Sam

P.S. The other reason why it would be great if it worked properly, is that the encoding seems to be pretty speedy with GPU acceleration.

diagnosys:

1) export a uncompressed tiff sequence: is it still green?
2) if not, are you working with ACES? (That will make the scene green and I can explain you why)
3) do you have any LUT?
4) which is the original color space and final color space?

waltervolpatto wrote:diagnosys:

1) export a uncompressed tiff sequence: is it still green?
2) if not, are you working with ACES? (That will make the scene green and I can explain you why)
3) do you have any LUT?
4) which is the original color space and final color space?

Ohh, please explain about why aces does that. Is this because it is assumes a different white point from what rec 709 does? I want to know, very very much.

Dmitry Kitsov wrote:

waltervolpatto wrote:diagnosys:

1) export a uncompressed tiff sequence: is it still green?
2) if not, are you working with ACES? (That will make the scene green and I can explain you why)
3) do you have any LUT?
4) which is the original color space and final color space?

Ohh, please explain about why aces does that. Is this because it is assumes a different white point from what rec 709 does? I want to know, very very much.

Yes, at the moment ACES target a D60 white point, therefore if you do BW there and you convert to video the ODT will keep that white point hence tinting the image

I don't think there's a way around this without using another program to generate the h.264. An advantage of using another program, like Compressor, is you could make the files MUCH smaller while maintaining good viewing quality. It's an extra step, but it would significantly reduce upload/download times for sharing with clients.