ACES IDT-Research

(Eberhard Hasche) #1

Hi Everyone,

in the last years we have been researching ACES IDTs for RED Scarlet, Canon EOS 5D MarkIII and Blackmagic URSA mini pro cameras. We used a spectrometer as reference and compared the results with the recorded Macbeth Chart using Nuke. Our main goal was to get the same color out of the cameras and the Canon DSLR, wich came close in the end.

Here we share the last three paper we did for the Electronic Imaging Conference in San Francisco (Burlingame).
In the first paper we are comparing the results of RED color spaces. We also used some legacy color spaces which are now partially hidden.
Comparing ACES IDTs for RED Scarlet-X Camera SPIE 2018 .pdf (834.0 KB)

In the second paper we are comparing different strategies to convert Canon RAW data to ACES . Included are the results of several software packages and command line approaches and all the settings we used.
Comparing ACES IDTs for Canon 5D Mark3 Camera SPIE 2018 .pdf (857.1 KB)

In the third paper we are comparing our RED Scarlet-X camera with Blackmagic URSA mini pro and Canon EOS D5 Mark III. For the DSLR conversion we used RAWTOACES.
Among some efforts to reduce the measuring errors we also managed to get the spectral sensitivity data for the Canon EOS D5 Mark III which is not included in RAWTOACES and put them in. This gave us a much better result. Thanks to Dietmar Wueller from Image Engineering for passing us the data.
Refining ACES best Praxis SPIE 2019.pdf (4.0 MB)

Comments and suggestions for further research are very welcome. For the next paper we will compare some ACES LMT strategies from a VFX perspective, which means creating custom LMTs and pass them to Maya/Arnold Mar and Houdini using LUTs and CTL. A main topic will be addressing the problems using LUTs for HDR content and if the individual software packages are interpreting them correctly.

Best regards

Eberhard “Ebs”

Hasche

3 Likes
(Steve Tobenkin) #2

Thanks for your first post on ACESCentral and for sharing this testing you’ve done!
ST