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Aliasing on thin horizontal lines from R3Ds, with FullresPremium
Maybe doing something wrong, but when output to PAL (720×576) from 2k red R3Ds, with “smoother settings” chosen I have bad aliasing on textures and thin lines, which I’ve only seen on DSLR footage before, but not on red shots.
Could somebody help is it with red tab settings – OLPF and image detail? Or should I render HD and then downscale to PAL (what a silly proposition)
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8 Replies
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Are you using 1/2 res premium for the r3d decode?
Do you see the same issue with another 2K or HD source image rendered to Pal? -
FullresPremium. Source is 2k r3d. Didn’t try with QT source yet, will let You know after got a minute to test. After setting OLPF to max this effect became less noticable but didn’t disappear at all. (((
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Just a thought.
I’m not sure if this is application specific.
I worked on a feature film shot on Red @ 4k on a different online system. We were doing PAL copies for the director to watch in the evening and found these artefacts occurring when he checked his material on a Sony SD CRT SDI monitor.
My solution was to introduce a one pixel blur in vertical only and it displayed much better for him.
Not sure if it is the issue but may be worth trying out to see if this would give you a fix.
Hope this helps!
Dan
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If you are watching on a display that expects to be fed interlaced (most SD displays do), it’ll either try to show interlace (tube) or de-interlace (flats). Either method can expose problems with images that were very sharp from the beginning – I’ve seen this again and again when working with stills in the old days.
Consider RED as being just like stills: too sharp for PAL. So, the suggestion of a vertical blur is a good one, but 0.6 pixels should be enough for most footage.
The other option is shooting 50 fps and re-interlace it in SD.
Director of the Institute of Media Research (IMF) at Braunschweig University of Arts
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I have Pioneer plasma (about 3 years old 42 inch 720p) and sdi crt from Barco. Those artefacts extremely visible on plasma when PAL letterboxed image is zoomed to fit the screen and is very subtle on CRT monitor, but yet visible. For now I’ve decided just to apply deflicker filter at FCP which seems enough at minimum setting and which is actually simple vertical blur. But the whole picture quality degrades noticeably after deflicker (DOP was angry), and for the future projects I need to investigate method to scale down renders with no focus loss.
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check out plugin for fcp.
it does a bit differently this calculation … not just blur. more sophisticated i’d say.
“Reduce Flicker
Same as Blend Fields, but only blends where there’s interlace artifacts. Useful for removing flicker in text and still images while preserving as much sharpness as possible.”https://www.mattias.nu/plugins/
remember to donate 🙂
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Margus
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Thanks! It’s smart plug-in!
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I’ve had similar issues but found that it was the preview output (video card) causing the artifact. My dpx renders were free of artifacts when checked outside program.
NOTE: The comments above are strictly mine, and may not necessarily
represent those of my employers.Darin Wooldridge
Colorist / Technical Strategist
818-653-3918-cell
dwooldridge@mac.com
check me out at https://www.facebook.com/pages/Davinci-Resolve-Colorist/117363011609028?ref=….
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