mirror of
https://github.com/1disk/edp445.git
synced 2024-08-14 22:47:02 +00:00
21 lines
No EOL
711 B
JavaScript
21 lines
No EOL
711 B
JavaScript
const Canvas = require("@napi-rs/canvas");
|
|
|
|
module.exports = async (img) => {
|
|
const image = await Canvas.loadImage(img);
|
|
const canvas = await Canvas.createCanvas(image.width, image.height);
|
|
const ctx = canvas.getContext("2d");
|
|
ctx.drawImage(image, 0, 0);
|
|
|
|
const imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
|
|
|
|
for (let i = 0; i < imgData.data.length; i += 4) {
|
|
const brightness = 0.34 * imgData.data[i] + 0.5 * imgData.data[i + 1] + 0.16 * imgData.data[i + 2];
|
|
imgData.data[i] = brightness;
|
|
imgData.data[i + 1] = brightness;
|
|
imgData.data[i + 2] = brightness;
|
|
}
|
|
|
|
ctx.putImageData(imgData, 0, 0);
|
|
|
|
return canvas.encode("png");
|
|
}; |