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1. Re: Downscaling 4k to 1080p Export
Richard M Knight Sep 11, 2014 1:50 PM (in response to perfectblue)Scale to fill option should lose the black bars. When going from HD to SD it is usual to check the 'Use Maximum Render Quality' box, this provides better quality scaling, perhaps someone who has worked with 4k could tell us if this also applies to 4k to HD.
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2. Re: Downscaling 4k to 1080p Export
shooternz Sep 11, 2014 1:55 PM (in response to perfectblue)How did you arrive at those sequence settings?
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3. Re: Downscaling 4k to 1080p Export
perfectblue Sep 11, 2014 2:37 PM (in response to shooternz)shooternz That is just what seemed to appear by default. Is there something that I should change?
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4. Re: Downscaling 4k to 1080p Export
shooternz Sep 11, 2014 2:54 PM (in response to perfectblue)Not necessarily.
I just saw it was "custom" instead of a preset sequence.
I am not sure why the bars appear in your output. You can crop them out (top bottom crop X pixels in source tab) if all else fails.
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5. Re: Downscaling 4k to 1080p Export
perfectblue Sep 11, 2014 8:56 PM (in response to shooternz)There shouldn't be any black bars. I am following the guide by Dave Dugdale where he uses premiere to down sample 4k footage onto a 1080 timeline. His end result does not have black bars, while my end result does. To see the steps he is using check out the link to the video here, its very brief https://www.youtube.com/watch?v=9oEWvBsN63U&feature=youtu.be&t=43sfrom 00:43 to 1:20
I start by pulling down a sample of 4k footage onto create new sequence button. So the timeline is now 4k. Then I open sequence settings and change the video frame size to 1920x1080 from 4096x2160.
The projects source video file is 4096 x 2160
Here are the sequence settings
Here is the result showing black bars in the preview
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6. Re: Downscaling 4k to 1080p Export
shooternz Sep 11, 2014 9:04 PM (in response to perfectblue)Try dropping your 4k into a new1080p sequence and use scale to sequence setting on all the clips instead of using a custom preview setting.
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8. Re: Downscaling 4k to 1080p Export
Mark Mapes Sep 12, 2014 12:39 AM (in response to perfectblue)Right-click the clip(s) in the Timeline and select Scale to Frame Size or, if you have CC2014, Set to Frame Size. The former rasterizes the image; the latter uses the Scale effect on the Effect Controls panel.
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9. Re: Downscaling 4k to 1080p Export
cc_merchant Sep 12, 2014 2:12 AM (in response to perfectblue)There shouldn't be any black bars ...
The projects source video file is 4096 x 2160
Of course there are black bars, because to keep the same 16:9 HD dimensions (1920 x 1080), the starting point would be 3840 x 2160. Not 4096 x 2160.
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10. Re: Downscaling 4k to 1080p Export
perfectblue Sep 12, 2014 7:13 AM (in response to Mark Mapes)Thanks for the replies. Here are the results
Set to frame size
Scale to frame size- this one produces some rather strange effects as you can see.
As you can see neither of these remove the black bars, unless the source footage needs to be 3840 x 2160 as cc_merchant pointed out to scale these out to take up the full screen space.
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11. Re: Downscaling 4k to 1080p Export
Mark Mapes Sep 12, 2014 10:19 AM (in response to perfectblue)Right. We weren't thinking this through. Both Set to Frame Size and Scale to Frame Size adjust to fill in one dimension without cropping in the other. You want just the opposite, so you'll need to tweak the Scale setting manually. With your 4096x2160 footage, you'll want Scale set to 50%.










