try to take over the world!
// ==UserScript==
// @name Image invert when it is white
// @namespace http://tampermonkey.net/
// @version 0.1
// @description try to take over the world!
// @author alextooter
// @match *://*/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
// Your code here...
var canvas = document.createElement('CANVAS');
var ctx = canvas.getContext('2d');
function isWhite (img)
{
ctx.drawImage(img, 0, 0);
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
var r = 0;
var g = 0;
var b = 0;
var long = 120;
for (var i = 0; i < long; i += 4)
{
r+=data[i]; // red
g+=data[i + 1]; // green
b+=data[i + 2]; // blue
}
var rr = r/long*4;
var gg = g/long*4;
var bb = b/long*4;
var limit = 150;
if (rr > limit && gg > limit && bb > limit) {
return true;}
else {
return false;
}
};
var ilist = document.images;
for(var i = 0; i < ilist.length; i++)
{
if(isWhite(ilist[i]))
{
// deal with big images
ilist[i].style.filter="invert(1)";
}
else
{
ilist[i].style.filter="invert(0)";
}
}
})();