EXR grading! HELP NEEDED!

[JustinBromley]

Here's a simple question.....

When grading EXR's in Lustre, how do I get Flame (2012ext1) to view the images AS PER HOW THEY LOOK IN LUSTRE!!!!!

My grade LOOKS DIFFERENT ONCE I'M BACK IN FLAME!!!!!!! W.T.F.!!!!?????

The pictures are rendered back to flame at 16bitPF with "identity extended" etc etc...

They look similar but highlights/black levels/contrast is different. No heaps, but enough to notice.

frustrated!

[JustinBromley]

It would seem this display problem has something to do with the 16bit depth. If I render the images back to flame as 10bitDPX's they look fine. That is all well and good, but ideally I'd like to keep the workflow 16bit until final output.

[snopkovgv]

Are you using input lut in Lustre? Did you read manual about 16bit fp?

[JustinBromley]

I do love a good read of the manual, and that was the first thing I looked at. Also lots of emails with our local autodesk guru.

So I'm not using an input LUT, but I am switching the floating point conversion (under settings/calibration) from log to lin.

I really don't have a problem with Lustre, but more likely a monitor viewport (linear mode) problem with flame.

As I said in the post, the picture difference from Lustre back to FLame is not massive (like a misplaced LUT in the render pipeline), its a subtle contrast issue.

I have Cedric Legeune looking into it as well, and at this stage he can't find an answer either...... thanks for your help.

[Anonymous]

Hi,

I would curious to know if the issue can be reproduced on our internal systems.

Can I please get your email address and I will follow up offline with you?

As soon as the issue will be narrowed down, I will post the details on the AREA.


Best regards,
Yann

yann.laforest@autodesk.com

[JustinBromley]

Hi Yann,

Thanks for the feedback..... Cedric has been in contact with Autodesk and got this reply from Doug Walker.....


"Unfortunately you can't easily setup Flame to view float images the same way
Lustre does.

The pipelines are completely different for historical reasons. In Lustre
there is a float-conversion 1d-LUT that converts a 16-float into a 16-int in
Lustre's working space. Then in Render-->Output you can set a 1d or 3d-LUT
which will tone-map as necessary. (See the log_default.fclut and
log_default_tonemap.lut in the Lustre lut directory for examples.)

In Flame, although you can apply a 16-float 1d-LUT in the LUT Editor, you
cannot in the Viewer. The best you could do would be to apply the viewing
transform as a LUT Editor in Batch. Also, it would have to be a different
LUT than the one used in Lustre.

Obviously this is not a good situation and we are working on improving it."

The short answer is Flame CANNOT display 16bitFP Images the same way Lustre does!!

Really hoping this is fixed in the next release.

[cedriclejeune]

We gonna work on that during the beta 🙂
And you're invited to the party, beta's the place to be during the summer!