Hi,
what a great application DOM is!
We've get a question regarding a check we did via the DOM-player.
A DCP has been made by DOM with DNxHR REC709, 16-235 legal levels, 4k.
In the DOM-player we openend the DCP and saved a frame to file (png) and imported this frame back in Avid Media Composer.
Now this frame has less luminance than the original. Please see the waveform with smpte bars (original file in media composer / dcp > player > save to frame > imported in media composer)
Do you have an explanation for this?
Thank you for your help!
Levels, save to frame check
-
Laurence
- Posts: 2
- Joined: Thu Oct 13, 2022 9:51 am
Levels, save to frame check
You do not have the required permissions to view the files attached to this post.
-
Carsten
- Posts: 2804
- Joined: Tue Apr 15, 2014 9:11 pm
- Location: Germany
Re: Levels, save to frame check
>In the DOM-player we openend the DCP and saved a frame to file (png)
How exactly did you do this?
You may also want to check wether your rec.709 uses gamma 2.2 or 2.4 - as both may be used with sources that claim to be rec.709.
- Carsten
How exactly did you do this?
You may also want to check wether your rec.709 uses gamma 2.2 or 2.4 - as both may be used with sources that claim to be rec.709.
- Carsten
-
Laurence
- Posts: 2
- Joined: Thu Oct 13, 2022 9:51 am
Re: Levels, save to frame check
Hello Carsten,
'Save frame to file' is an option in the DOM-player, under file.
Is there a choice within DOM between Rec.709 2.2 of Rec.709 2.4?
thank you for looking into this.
'Save frame to file' is an option in the DOM-player, under file.
Is there a choice within DOM between Rec.709 2.2 of Rec.709 2.4?
thank you for looking into this.
-
Carsten
- Posts: 2804
- Joined: Tue Apr 15, 2014 9:11 pm
- Location: Germany
Re: Levels, save to frame check
You can switch between rec.709 (2.2) and BT.1886 (2.4) in color conversion. You can also check the waveform monitor in DCP-o-matic at the timeline viewer position and compare the result.
I don't know what specific color retransform is enabled in DCP-o-matic player. The player is not a test tool, so I would assume some difference.
I probably mention this too often, but I regularly use VLCs video snapshot feature (mostly for geometric checks), but in VLC it is e.g. easy to load your source, take a video snapshot, then load the DCP (MXF) and take a video snapshot from the same position. I guess I'll try that later and compare both with DCP-o-matic player single frame export.
I don't know what specific color retransform is enabled in DCP-o-matic player. The player is not a test tool, so I would assume some difference.
I probably mention this too often, but I regularly use VLCs video snapshot feature (mostly for geometric checks), but in VLC it is e.g. easy to load your source, take a video snapshot, then load the DCP (MXF) and take a video snapshot from the same position. I guess I'll try that later and compare both with DCP-o-matic player single frame export.