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Any way to correct over-sharpened footage?  


glitterball3
(@glitterball3)
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Is there any way to achieve something similar to the technique described at 05:00 in this video (DaVinci resolve)?
https://mixinglight.com/color-grading-tutorials/handling-over-sharpening-how-to-soften-footage-without-losing-detail/

There is an 'Edge' effect in Cinelerra which does a nice job at detecting the oversharpened edges, but I've no idea how this could be used as a mask to blur those nasty edges out.

 


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phylsmith2004
(@phylsmith2004)
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@glitterball3

After watching about 6 minutes of the video just to get an understanding, I thought that the OpenCV StyleOjb plugin "Smooth Recursive" option might be a way to correct over-sharp but I tried it.  Manual documentation quote:

There are two edge preserving methods available – one to smooth the image edges, and the other to not smooth the edges/color boundaries, but instead replace the color values at a pixel by the average of the pixels around the area which have color similar to that pixel.

Figure 10.84 show the images after adding the 6 various styles (figure # may be a different number depending on date of Manual).  Anyway it did not seem to do the job.  I also experimented with F_deblock and F_unsharp with no success.  I am out of ideas so you may have to do it outside of Cinelerra.


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glitterball3
(@glitterball3)
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@phylsmith2004

Thanks for looking into this.


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glitterball3
(@glitterball3)
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I've found a way to achieve a similar effect if anyone is interested:

The 'F_smartblur' effect will smooth the over-sharpened edges on DJI 3840x2160 D-cinelike footage with settings set to something like:

luma_radius: 3.247993
luma_strength: 0.360153
luma_threshold: -2

Everything else at default values.


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andreapaz
(@andreapaz)
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Great. Thanks for the tip. Very helpful.


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IgorBeg
(@igorbeg)
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Hi @glitterball3, thanks for sharing!

Had you tried to use the "Blur" effect? You can try "Blur" effect with all the options checked except the two options, Vertical and Alpha. Yes, it blur all the pixels, not only the edges, but sometimes it works for that. Unfortunately Cinelerra-GG don't use node like other NLEs do.


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phylsmith2004
(@phylsmith2004)
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Joined: 2 years ago
Posts: 153
 

@glitterball3

Thanks! I added this tip/example to F_smartblur documentation in the manual as it will be useful to others (not updated on website yet though).


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