Old 04-07-2019, 09:12 AM   #1
hermbot
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Default Image overlay zoom very poor quality

Hello,

When overlaying an image in my video, I am using the Video Processor opacity / zoom / location plugin to move my image over to the right in front of some video.

When I use the zoom functionality to reduce the size of the picture, however, the quality of the image goes way down, it gets very pixelated and blurry. Is this normal?

Example: https://imgur.com/Howmbrc

It's a .PNG file, if that matters.
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Old 04-08-2019, 05:23 AM   #2
David Else
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I just had a look at this, and it seems there is some massive problem with Reaper image resize quality. I assuming that the fullscreen preview is the same as the full slow render, here is my very quick rough test:

https://www.learndigitalaudio.com/wp...om-quality.png

Look at the top of the plane in the Reaper render, it is jagged and really bad looking.

I have a horrible feeling we are seeing Nearest-neighbor interpolation, the lowest quality resize algo. If this is the case I am praying we can get at least Bicubic asap:

https://en.wikipedia.org/wiki/Image_scaling

Quote:
Bicubic interpolation yields substantially better results, with only a small increase in computational complexity.
Justin, could you set the record straight on this? I thought FFMPEG used bicubic scaling by default?
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Last edited by David Else; 04-08-2019 at 05:29 AM.
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Old 04-08-2019, 03:58 PM   #3
hermbot
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Thanks for the reply, at least I know it's not just me!
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Old 04-08-2019, 08:20 PM   #4
JamesPeters
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Did you turn the filter parameter to 1 (on)?

You can also use "image overlay" preset (and you'll probably have to enable the filter). This preset will allow you to use PNG which have transparent/alpha.
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Old 04-09-2019, 02:47 AM   #5
David Else
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Quote:
Originally Posted by JamesPeters View Post
Did you turn the filter parameter to 1 (on)?

You can also use "image overlay" preset (and you'll probably have to enable the filter). This preset will allow you to use PNG which have transparent/alpha.
OMG you did it again! Thanks. I did not see the "image overlay", it is not obvious that it is needed as the .png image just displays anyway and the other presets with zoom work too. "image overlay" + filter 1 and results are much better

@hermbot, how about you?
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Old 04-10-2019, 09:08 AM   #6
SonicAxiom
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with the filter parameter set to "on", overlay zooming results are still far from smooth. The same is true when zooming text overlays. I hope that these issue will get addressed soon.

.
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