mirror of
https://github.com/1disk/edp445.git
synced 2024-08-14 22:47:02 +00:00
22 lines
No EOL
749 B
JavaScript
22 lines
No EOL
749 B
JavaScript
const Canvas = require("@napi-rs/canvas");
|
|
|
|
module.exports = async (img, amount = 50) => {
|
|
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) {
|
|
var r = imgData.data[i];
|
|
var g = imgData.data[i + 1];
|
|
var b = imgData.data[i + 2];
|
|
var v = (0.2126 * r + 0.7152 * g + 0.0722 * b >= amount) ? 255 : 0;
|
|
imgData.data[i] = imgData.data[i + 1] = imgData.data[i + 2] = v
|
|
}
|
|
|
|
ctx.putImageData(imgData, 0, 0);
|
|
|
|
return canvas.encode("png");
|
|
}; |