Latest post Tue, Aug 21 2018 10:36 AM by Kestiu. 7 replies.
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  • Fri, Aug 17 2018 11:58 AM

    • Kestiu
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    Scale From Legal to Full Range

    Hey there,

     

    Even though I did a fair bit of research and asked several people for expertise there doesnt seem to be a clear answer to this anywhere. 

     

    Basically, we have used MXF files for our exports that come out of Nucoda in the default Legal Range color space. However we exported everything using Scale From Legal to Full Range setting. H264, Quicktime codec. The exports will be watched on various monitors, projectors and TV screens (not online). As I can see looking at the exports now - the blacks do seem crushed when watching it on Quicktime player but they seem fine when watching it with VLC.

     

    My question is: did we make a mistake by exporting everything with the Full Range setting? Even though the MXF's we used as I mentioned were exported in Legal range (16 - 235) so technically this export setting should scale it to full range (00 - 250). 

  • Sat, Aug 18 2018 8:37 PM In reply to

    • jef
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    Re: Scale From Legal to Full Range

    Kestiu:

    The exports will be watched on various monitors, projectors and TV screens (not online).

    You should not Scale from Legal to Full Range for the devices noted.  Legal is Avid's label for broadcast type devices. Full range is for use on computer based monitors / viewing, not what you described.

    Jef

     

    Avid DS 11.0.2 R.I.P | MC "Well, it depends ..." mostly 8.11.0 but playing w 2018.12.6|OS 10.14.x - iMac 2017 - home system MacPro Dual 2.8 8core... [view my complete system specs]

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  • Sun, Aug 19 2018 8:01 AM In reply to

    Re: Scale From Legal to Full Range

    Friends don’t let friends do custom QT h264 exports from inside Media Composer. It uses the old, slow QT engine and Apple QT h264 codec that is notorious for causing gamma shifts and mis-flagging content. So what appears to happen is that you expand to 0-255, while the encoder still flags the content as 16-235. QT player then reads that flag and ‘corrects’ for that, while VLC does not.

    I usually export same-as-source from MC, then encode to h264 in Handbrake. Fast and good quality (you need to tinker with the settings, though).

    Media Composer /w Symphony option | PT-HD | Win7Pro64 HP | OSX MBP | ISIS5000 | Nitris DX | Artist Mix & Transport & Color | AJA T-Tap | Decklink... [view my complete system specs]
  • Sun, Aug 19 2018 2:05 PM In reply to

    • jef
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    Re: Scale From Legal to Full Range

    Job ter Burg:

    Friends don’t let friends do custom QT h264 exports from inside Media Composer.

    T-shirt anyone?

    Smile

    Jef

    Avid DS 11.0.2 R.I.P | MC "Well, it depends ..." mostly 8.11.0 but playing w 2018.12.6|OS 10.14.x - iMac 2017 - home system MacPro Dual 2.8 8core... [view my complete system specs]

    _____________________________________________

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    Old Stuff  http://vimeo.com/album/3037796

  • Mon, Aug 20 2018 5:32 PM In reply to

    • Marianna
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    Re: Scale From Legal to Full Range

    jef:

    Job ter Burg:

    Friends don’t let friends do custom QT h264 exports from inside Media Composer.

    T-shirt anyone?

    Smile

    Jef

    OMG I belted out a laugh!

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  • Mon, Aug 20 2018 11:48 PM In reply to

    • Martin Fox
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    Re: Scale From Legal to Full Range

    Very difficult to control the playback environment.

    if you are watching on a tv or a projector then the display device will scale “legal” levels to full range (perceptually) for you. If you are watching on a computer monitor it won’t scale, but the player might!

    I do mp4 files full range, expecting they will be played on a computer. I do professional codecs “legal” expecting they will be played on a video monitor.

    Vimeo for example expects legal range, and it will scale levels in its player.

    OUCH!

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  • Tue, Aug 21 2018 2:08 AM In reply to

    • jef
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    Re: Scale From Legal to Full Range

    Martin Fox:

    Very difficult to control the playback environment.

    Ain't that the truth.  Even between two of the same monitors in the same room sometimes .....

    Jef

    Avid DS 11.0.2 R.I.P | MC "Well, it depends ..." mostly 8.11.0 but playing w 2018.12.6|OS 10.14.x - iMac 2017 - home system MacPro Dual 2.8 8core... [view my complete system specs]

    _____________________________________________

    Jef Huey

    Senior Editor

    Old Stuff  http://vimeo.com/album/3037796

  • Tue, Aug 21 2018 10:36 AM In reply to

    • Kestiu
    • Not Ranked
    • Joined on Tue, Apr 17 2018
    • Posts 6
    • Points 80

    Re: Scale From Legal to Full Range

    I see, thank you. 

     

    Thank you all for replying, I have a better understanding of this issue now. We re-exported everything using Legal range as most likely the devices used for screening will read the file as legal range and scale it automatically. 

     

     

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