mirror of
https://github.com/danbulant/pngjs
synced 2026-05-19 04:08:44 +00:00
22 lines
678 B
JavaScript
22 lines
678 B
JavaScript
let fs = require("fs"),
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PNG = require("../lib/png").PNG; // note require('pngjs') outside this project
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fs.createReadStream("test/in/basi0g01.png")
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.pipe(new PNG({}))
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.on("parsed", function () {
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for (let y = 0; y < this.height; y++) {
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for (let x = 0; x < this.width; x++) {
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let idx = (this.width * y + x) << 2;
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// invert color
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this.data[idx] = 255 - this.data[idx];
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this.data[idx + 1] = 255 - this.data[idx + 1];
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this.data[idx + 2] = 255 - this.data[idx + 2];
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// and reduce opacity
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this.data[idx + 3] = this.data[idx + 3] >> 1;
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}
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}
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this.pack().pipe(fs.createWriteStream("out.png"));
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});
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