How do I blend pixels in a frame

[lansing]

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?

https://i.imgur.com/zgafQun.png

[LoRd_MuldeR]

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

https://i.imgur.com/tPBVuNW.png

[lansing]

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"

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]

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.


# 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]

Try a horizontal BoxBlur with many passes?

[lansing]

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.


# 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?