ACES_OT_VWG_SampleFrames 60 and 61 cannot be applied by ODT CTL

Discussions - ACESNext VWG – Output Transforms
1

Since ACES 2.0 ODT is frozen, I wanted to see the results so I used ctlrender to apply Rec709-D65_BT1886.ctl to ACES_OT_VWG_SampleFrames, but I’m getting repeated errors at frames 60 and 61. Is there something I am missing please?

After that I tried re-downloading the frames but the error persists, I tried another CTL as well.

Also the relationship dump file for Ubuntu I am using is not very easy to get, after waking up from a sleep I will try to get him for those who need it.

2024-12-28 034236
2024-12-28 0342362155×1153 310 KB

2

I ran into this same issue before. It’s because the dataWindow and displayWindow in the EXR for those two frames do not match, and ctlrender seems to have an issue with that.

exrinfo ./ACES_OT_VWG_SampleFrames.0060.exr
...
  type: 'scanlineimage'  compression: 'none'
  displayWindow: [ 0, 0 - 1919 1079 ] 1920 x 1080
  dataWindow: [ 0, 143 - 1919 1079 ] 1920 x 937
  channels: 3 channels
   'B': half samp 1 1
   'G': half samp 1 1
   'R': half samp 1 1

I had made replacements in my local files but I guess didn’t update them on the repository.

3

Yes, I get the same results. Can you upload the fixed file to the repository or provide a way to fix it? I’m too unfamiliar with this kind of editing.
Thanks!

file ./p0060.exr:

file format version: 2, flags 0x0
acesImageContainerFlag (type int): 1
channels (type chlist):
    B, 16-bit floating-point, sampling 1 1
    G, 16-bit floating-point, sampling 1 1
    R, 16-bit floating-point, sampling 1 1
chromaticities (type chromaticities):
    red   (0.7347 0.2653)
    green (0 1)
    blue  (0.0001 -0.077)
    white (0.32168 0.33767)
compression (type compression): none
dataWindow (type box2i): (0 143) - (1919 1079)
displayWindow (type box2i): (0 0) - (1919 1079)

file ./p0061.exr:

file format version: 2, flags 0x0
acesImageContainerFlag (type int): 1
channels (type chlist):
    B, 16-bit floating-point, sampling 1 1
    G, 16-bit floating-point, sampling 1 1
    R, 16-bit floating-point, sampling 1 1
chromaticities (type chromaticities):
    red   (0.7347 0.2653)
    green (0 1)
    blue  (0.0001 -0.077)
    white (0.32168 0.33767)
compression (type compression): none
dataWindow (type box2i): (0 32) - (1919 1079)
displayWindow (type box2i): (0 0) - (1919 1079)
4

I pushed updated frames for 59-61 to the repository.

You can also download the image sequence from this Dropbox link.

1 Like
5

Hey @sdyer

there is another link with even more frames, right ? It is called “[aces_sequence]”.

It is an “official” repo from the Academy, correct ?

Thanks !

6

That is a different (and much larger) image set.

The frames mentioned here are from the subset of frames called “ACES_ODT_SampleFrames” that was selected and labeled with a burn-in so that the group could unambiguously discuss particular frames during the Output Transform dev work.

7

Understood ! Thanks Scott ! I was curious about the two repos. Happy new year !