Quantcast QTGMC output is blurred? - digitalFAQ Forum
  #1  
05-19-2022, 02:51 PM
Major17Wood Major17Wood is offline
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I'm noticing that deinterlacing is causing loss of sharpness in my captures.

Left side of screenshot is software yadif deinterlace in VLC, right is QTGMC deinterlaced

The jaggies on the date and time numbers have been smoothed. I do not like this. How can I stop QTGMC from smoothing the image?

My only QTGMC setting is
Code:
QTGMC(Preset="Slow")
Is there a way for me to upload a better quality screenshot? The image uploaded here is being super compressed for some reason and kinda making it hard to see what I'm talking about. If you look at the "2's" you may be able to see it. On the left, the "2" has a pixelly staircase look, on the right its been totally smoothed flat into a diagonal line.


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  #2  
05-19-2022, 04:13 PM
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lordsmurf lordsmurf is offline
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Do not use slow. Use faster.
Slow has excess filtering that blurs. That's the difference.

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  #3  
05-19-2022, 06:49 PM
Major17Wood Major17Wood is offline
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It's still smoothing it out it seems.

Heres the script I'm using:

AviSource("C:\Users\Dave\Desktop\test.avi")
AssumeTFF()
QTGMC(Preset="faster")
Crop(4, 0, -4, -8)
LanczosResize(1440, 1080)


Attached Files
File Type: avi test.avi (24.34 MB, 9 downloads)
File Type: mp4 test.mp4 (8.26 MB, 7 downloads)
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  #4  
05-20-2022, 03:26 AM
Hushpower Hushpower is offline
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Quote:
The image uploaded here is being super compressed for some reason and kinda making it hard to see what I'm talking about.
We're trying to convince the Lordsmurf to increase the allowable postable image size!
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  #5  
05-20-2022, 04:04 AM
lollo2 lollo2 is online now
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QTGMC reduces jagged shapes created by deinterlacing procedures. This is one of its major benefits, a side effect is the one you experimented on a "real" jagged shape.

QTGMC can rarely be used with its defaults parameters, whatever preset you choose (BTW "fast" in only recommended for speed reason, not for optimal results).

Try to use QTGMC's lossless and sourcematch features:

Code:
QTGMC(Lossless=2, SourceMatch=3, ...)
For a "natural" look I sometimes use the following set, but you have to experiment with your own material:

Code:
QTGMC(preset="slow", matchpreset="slow", matchpreset2="slow", sourcematch=3, tr1=2, tr2=1, NoiseTR=2, sharpness=0.1)

A channel on S-VHS / VHS capture and AviSynth restoration https://bit.ly/3mHWbkN
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  #6  
05-20-2022, 04:46 AM
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lordsmurf lordsmurf is offline
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Quote:
Originally Posted by Hushpower View Post
We're trying to convince the Lordsmurf to increase the allowable postable image size!
No convincing necessary. It's part of a larger forum upgrade. That monster project is just taking time. Must hire some devs for key pieces, so that's the bottleneck. And people think I'm slow sometimes!

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The following users thank lordsmurf for this useful post: Hushpower (05-20-2022)
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