How do I blend pixels in a frame

lansing · 10th February 2018, 22:01

I have a color palette and I want to blend the edge of every color with the one right next to it so that there's a smooth gradient in the transition. Is there any filter that can do this?

LoRd_MuldeR · 10th February 2018, 23:28

Downscale to a width of 8, using point-resize (nearest neighbor), then upscale to a width of 800 again, using your preferred kernel?

lansing · 11th February 2018, 00:33

Thanks it works for width of 8, but when I try to do it with 6 on a six color palette, it gives me an error "Resize error 3076: image shift or subwindow too great"

Code:

image = core.imwrif.Read(r'blend.png')
image = core.resize.Point(image, width=6, height=100)
blend_image = core.resize.Spline36(image, width=600, height=100)

Stephen R. Savage · 11th February 2018, 00:36

The 6-tap Spline36 filter is too wide to be used on a 6-pixel image. Either use more colors or choose a narrower filter.

Code:

# Two-stage approach.
c = core.std.BlankClip(width=6, height=1)
c = core.resize.Spline16(c, width=12, height=1)
c = core.resize.Spline36(c, width=600, height=1)

# Narrow filter approach
c = core.std.BlankClip(width=6, height=1)
c = core.resize.Spline16(width=600, height=1)

Myrsloik · 11th February 2018, 01:08

Try a horizontal BoxBlur with many passes?

lansing · 11th February 2018, 02:24

Quote:

Originally Posted by Stephen R. Savage

The 6-tap Spline36 filter is too wide to be used on a 6-pixel image. Either use more colors or choose a narrower filter.

Code:

# Two-stage approach.
c = core.std.BlankClip(width=6, height=1)
c = core.resize.Spline16(c, width=12, height=1)
c = core.resize.Spline36(c, width=600, height=1)

# Narrow filter approach
c = core.std.BlankClip(width=6, height=1)
c = core.resize.Spline16(width=600, height=1)

My color palette is going to be a lot wider than 6, so there's no need for the spline16 as the intermediate step?

10th February 2018, 22:01	#1 \| Link
lansing Registered User Join Date: Sep 2006 Posts: 1,657	How do I blend pixels in a frame I have a color palette and I want to blend the edge of every color with the one right next to it so that there's a smooth gradient in the transition. Is there any filter that can do this?

10th February 2018, 23:28	#2 \| Link
LoRd_MuldeR Software Developer Join Date: Jun 2005 Location: Last House on Slunk Street Posts: 13,251	Downscale to a width of 8, using point-resize (nearest neighbor), then upscale to a width of 800 again, using your preferred kernel? __________________ Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ Last edited by LoRd_MuldeR; 10th February 2018 at 23:30.

11th February 2018, 00:33	#3 \| Link
lansing Registered User Join Date: Sep 2006 Posts: 1,657	Thanks it works for width of 8, but when I try to do it with 6 on a six color palette, it gives me an error "Resize error 3076: image shift or subwindow too great" Code: image = core.imwrif.Read(r'blend.png') image = core.resize.Point(image, width=6, height=100) blend_image = core.resize.Spline36(image, width=600, height=100)

11th February 2018, 01:08	#5 \| Link
Myrsloik Professional Code Monkey Join Date: Jun 2003 Location: Kinnarps Chair Posts: 2,580	Try a horizontal BoxBlur with many passes? __________________ VapourSynth - proving that scripting languages and video processing isn't dead yet

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