Thomas Singh February 12, 2018 Share February 12, 2018 I'm curious if 16-bit Open EXR is a part of your workflow? Link to comment Share on other sites
Dylan R. Hopkin February 12, 2018 Share February 12, 2018 Yes, VFX comps often get delivered as EXR for feature films and TV drama. 2 1 Link to comment Share on other sites
Thomas Singh February 15, 2018 Author Share February 15, 2018 Do you handle them differently than cineon DPX files? Is there anything I should know about or prepare before receiving them? Waiting a batch next week. Link to comment Share on other sites
Margus Voll February 18, 2018 Share February 18, 2018 Sometimes compression helps on file size but i think there was post if that affects playback. Can not remember now the place it was talked about but felt like it could depend on system. I use them daily basis for VFX shots coming back specially ACES in mind as all prores and such killed color data in heart beat. My system does not seem any different but really depends on your machine, drives and overall performance vs resolution. Better is to test it out every time when you can before job how your machine and platform handles it. Also keep in mind and talk to your VFX house if any involved how they give you mattes and in which channel as EXR can have many many embeded. Works great if everybody knows what they are doing. 2 Link to comment Share on other sites
Andy Minuth February 18, 2018 Share February 18, 2018 One should make sure to save Linear data to OpenEXR files, to maintain the best color fidelity. A log colour space saved to an OpenEXR file might work, but will only use a small fraction of the available bit depth. 3 Link to comment Share on other sites
Thomas Singh February 18, 2018 Author Share February 18, 2018 (edited) Strange that a 'linear format' got that popular. Guess it means you need to de-linearize it as most color approaches today starts with log. Do you happen to know why EXR is linear and not log @Andy Minuth? Not proper terms I know. Edited February 25, 2018 by Thomas Singh Link to comment Share on other sites
Andy Minuth February 27, 2018 Share February 27, 2018 Log encodings were developed to effectively store high dynamic range images with integer codings. Integer formats are limited in dynamic range to 0..1. OpenEXR is a much more advanced idea and was developed for the computer-graphics industry, where linear floating-point coding is a native format. It combines a lot of advantages: For example the effective coding of log, with the almost unlimited dynamic range of floating-point, etc. 4 1 Link to comment Share on other sites
Thomas Singh March 1, 2018 Author Share March 1, 2018 Interesting thought that linear images can hold more information than log. Link to comment Share on other sites
Dennis Schmitz June 26, 2018 Share June 26, 2018 Started using a linear workflow using ACES for my first feature film (am a producer, was DP and do Colorgrading and some VFX) a few weeks ago. Premiere for Editing -> AAF for Audio -> XML to Resolve -> Grading in ACES CC still using REC709 ODT -> linear OpenEXR DWAA for FX without ODT -> OCIO linear workflow in After Effects -> OpenEXR DWAA back to Resolve -> ACES with ODT again. Everything looks like it should, extended DR AND HDR compability in the future. Link to comment Share on other sites
Cary Knoop June 27, 2018 Share June 27, 2018 On 2/18/2018 at 9:44 AM, Andy Minuth said: One should make sure to save Linear data to OpenEXR files, to maintain the best color fidelity. A log colour space saved to an OpenEXR file might work, but will only use a small fraction of the available bit depth. Because you need less bit depth in log with the same fidelity. Most of the bit depth is wasted in the highlights in linear while you need a lot of it in the shadows. Link to comment Share on other sites
