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Life & fun · August 20, 2022

An attempt to make a reduce-palette/dither filter for 2d canvas images

An attempt to make a reduce-palette/dither filter for 2d canvas images launched on August 20, 2022 with 21 votes, #861 of 3,307 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 4 years on.

Visit scrawl-v8.rikweb.org.uk ↗Alternatives

In plain words

This tool applies reduce-palette and dither filters to 2D canvas images. It's designed for users who want to process digital images with retro or stylized effects by limiting color ranges and applying dithering techniques. The project represents an experimental approach to implementing these classic image processing effects for web-based canvas manipulation.

written from the facts on this page · September 2026

From the sources

When calculating the "commonest colors" palette, color selection is dependent on the "minimum color distance" attribute - changing this will affect colors selected for the palette. Be aware that every image is different: settings that produce a good result in one image will produce terrible results for other images. To note: Javascript is not running in this browser environment. The canvas element is ignored; instead a placeholder image displays where the canvas would have appeared. Note that this is a resource-intensive filter. Memoization is strongly advised! Known issue (2024-08-26): Beyond the simplest of predefined grayscale settings, this filter can becomes very computationally…from scrawl-v8.rikweb.org.uk

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