Toots for demofox@mastodon.gamedev.place account

Shared by demofox on 2025-01-23 at 04:29 (original by SnoopJ)

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Shared by demofox on 2025-01-23 at 04:02 (original by xenia :possum: :therian:)

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Shared by demofox on 2025-01-23 at 01:17 (original by Håkan Geijer)

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Shared by demofox on 2025-01-22 at 19:11 (original by boggo)

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Shared by demofox on 2025-01-22 at 04:57 (original by Jepsen)

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Shared by demofox on 2025-01-22 at 04:21 (original by Ryan C. Gordon)

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Shared by demofox on 2025-01-22 at 02:05 (original by mcc)

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Shared by demofox on 2025-01-22 at 00:09 (original by Laura Manach :bongoCat:)

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Shared by demofox on 2025-01-21 at 17:21 (original by CatSalad🐈🥗 (D.Burch) :blobcatrainbow:)

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Shared by demofox on 2025-01-21 at 15:28 (original by nen)

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Shared by demofox on 2025-01-21 at 07:11 (original by your auntifa liza 🇵🇷 🦛 🦦)

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Shared by demofox on 2025-01-21 at 01:45 (original by troy_s :praxis_100:)

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Shared by demofox on 2025-01-21 at 01:45 (original by M.S. Bellows, Jr.)

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Written by demofox on 2025-01-20 at 21:46

Yeah mystery solved... it's the quantized values used in Bayer that are causing the banding.

Here the image is dithered and quantized to 2 bits per color channel. Top is white noise limited to 4 discrete values. Bottom is white noise with full range of floating point values.

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Written by demofox on 2025-01-20 at 21:41

oops, 3 bits per color channel is 512 colors, but not 512 values in the bayer matrix. Each channel is treated independently, so this is just a 4x2 bayer matrix = 8 values (shades).

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Shared by demofox on 2025-01-20 at 21:39 (original by b9AcE)

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Written by demofox on 2025-01-20 at 20:35

At 3 bits per color it doesn't converge either though. Still ugly banding in the sky. That's 512 values, so is 1/512. Something else must be going on.

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Written by demofox on 2025-01-20 at 20:29

Bayer totally bites it at 1 bit per pixel (8 colors), with a 2x4 matrix. FAST STBN works just fine.

(I'm working on a dithering & stippling blog post)

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Written by demofox on 2025-01-20 at 20:27

Quantizing an image to 2 bits per color channel (64 colors). Dithering with 8x8 bayer (top) and FAST spatiotemporal blue noise (bottom).

Randomly offsetting bayer each frame, it doesn't converge.

That is weird.

The bayer matrix averages to 0.5 so is unbiased in that regard.

I think it must be due to Bayer having 1/64th values, while the blue noise has 1/256th values.

hmm...

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Shared by demofox on 2025-01-20 at 17:43 (original by Joanna Holman)

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