Created
July 20, 2024 05:35
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Grayscale Image Halftone dithering // Best algorithm
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| onmessage = ({ data: { data, width, height } }) => { | |
| const add = (d, i, v) => { | |
| if (i >= d.length) return; | |
| d[i] += v; | |
| }; | |
| let i = 0, | |
| w = width * 4; | |
| for (let y = 0; y < height; y++) { | |
| for (let x = 0; x < width; x++, i += 4) { | |
| let curPixel = data[i]; | |
| let newPixel = curPixel < 129 ? 0 : 255; | |
| let err = Math.floor((curPixel - newPixel) / 8); | |
| data[i + 0] = newPixel; | |
| data[i + 1] = newPixel; | |
| data[i + 2] = newPixel; | |
| add(data, i + 4, err); | |
| add(data, i + 8, err); | |
| add(data, i + w - 4, err); | |
| add(data, i + w, err); | |
| add(data, i + w + 4, err); | |
| add(data, i + w * 2, err); | |
| } | |
| } | |
| postMessage(data); | |
| }; |
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