Reducing speculars

Cary Knoop · 24th August 2020, 19:22

Is there a filter I can use that reduces specular areas by extending the outside non-specular pixel values slightly inwards?

A "cheap" version of such a filter would be to overlay a box or Gaussian blur on the frame and mask the overlay with everything but the highest luma values of the original.

Or perhaps better a convolutional filter that "bleeds" the current pixel value into a neighboring pixel if that pixel value is (close to) max.

lansing · 24th August 2020, 21:28

What is a specular?

Cary Knoop · 24th August 2020, 21:53

Quote:

Originally Posted by lansing

What is a specular?

https://en.wikipedia.org/wiki/Specul...%20a%20surface.

ifb · 24th August 2020, 23:49

So you want knee controls? That's how you would do it live, but if your highlights are already blown out it's not going to magically help. It sounds like you want to try inpainting the speculars?

Cary Knoop · 25th August 2020, 00:15

Quote:

Originally Posted by ifb

So you want knee controls?

No, I am not asking for knee controls.

Quote:

Originally Posted by ifb

It sounds like you want to try inpainting the speculars?

No, I don't want to implant them, I want to make them marginally smaller before I upscale.

I can do it in DaVinci Resolve with a DCTL, I was just wondering if someone already knows of an applicable filter in Vapoursynth.

24th August 2020, 19:22	#1 \| Link
Cary Knoop Cary Knoop Join Date: Feb 2017 Location: Newark CA, USA Posts: 397	Reducing speculars Is there a filter I can use that reduces specular areas by extending the outside non-specular pixel values slightly inwards? A "cheap" version of such a filter would be to overlay a box or Gaussian blur on the frame and mask the overlay with everything but the highest luma values of the original. Or perhaps better a convolutional filter that "bleeds" the current pixel value into a neighboring pixel if that pixel value is (close to) max. Last edited by Cary Knoop; 24th August 2020 at 22:08.

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24th August 2020, 21:28	#2 \| Link
lansing Registered User Join Date: Sep 2006 Posts: 1,657	What is a specular?

24th August 2020, 23:49	#4 \| Link
ifb Registered User Join Date: Dec 2009 Posts: 72	So you want knee controls? That's how you would do it live, but if your highlights are already blown out it's not going to magically help. It sounds like you want to try inpainting the speculars?