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20 lines
No EOL
821 B
JavaScript
20 lines
No EOL
821 B
JavaScript
const Canvas = require("@napi-rs/canvas");
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module.exports = async (img) => {
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const image = await Canvas.loadImage(img);
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const canvas = await Canvas.createCanvas(image.width, image.height);
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const ctx = canvas.getContext("2d");
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ctx.drawImage(image, 0, 0);
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const imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
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for (let i = 0; i < imgData.data.length; i += 4) {
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imgData.data[i] = imgData.data[i] * 0.393 + imgData.data[i + 1] * 0.769 + imgData.data[i + 2] * 0.189;
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imgData.data[i + 1] = imgData.data[i] * 0.349 + imgData.data[i + 1] * 0.686 + imgData.data[i + 2] * 0.168;
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imgData.data[i + 2] = imgData.data[i] * 0.272 + imgData.data[i + 1] * 0.534 + imgData.data[i + 2] * 0.131;
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}
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ctx.putImageData(imgData, 0, 0);
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return canvas.encode("png");
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} |