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blank.html
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<!DOCTYPE html>
<html>
<head>
<title>undefined</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="generator" content="Ninja">
<style type="text/css">
html, body {
width: 100%;
height: 100%;
margin: 0;
}
</style>
<script>
function generateRGBKs( img ) {
var w = img.width;
var h = img.height;
var rgbks = [];
var canvas = document.createElement("canvas");
canvas.width = w;
canvas.height = h;
var ctx = canvas.getContext("2d");
ctx.drawImage( img, 0, 0 );
var pixels = ctx.getImageData( 0, 0, w, h ).data;
// 4 is used to ask for 3 images: red, green, blue and
// black in that order.
for ( var rgbI = 0; rgbI < 4; rgbI++ ) {
var canvas = document.createElement("canvas");
canvas.width = w;
canvas.height = h;
var ctx = canvas.getContext('2d');
ctx.drawImage( img, 0, 0 );
var to = ctx.getImageData( 0, 0, w, h );
var toData = to.data;
for (
var i = 0, len = pixels.length;
i < len;
i += 4
) {
toData[i ] = (rgbI === 0) ? pixels[i ] : 0;
toData[i+1] = (rgbI === 1) ? pixels[i+1] : 0;
toData[i+2] = (rgbI === 2) ? pixels[i+2] : 0;
toData[i+3] = pixels[i+3] ;
}
ctx.putImageData( to, 0, 0 );
// image is _slightly_ faster then canvas for this, so convert
var imgComp = new Image();
imgComp.src = canvas.toDataURL();
rgbks.push( imgComp );
}
return rgbks;
}
// function generateRGBKs(img) {
// var w = img.width;
// var h = img.height;
// var rgbks = [];
//
//
// }
function generateTintImage( img, rgbks, red, green, blue ) {
var buff = document.createElement( "canvas" );
buff.width = img.width;
buff.height = img.height;
var ctx = buff.getContext("2d");
ctx.globalAlpha = 1;
ctx.globalCompositeOperation = 'copy';
ctx.drawImage( rgbks[3], 0, 0 );
ctx.globalCompositeOperation = 'lighter';
if ( red > 0 ) {
ctx.globalAlpha = red / 255.0;
ctx.drawImage( rgbks[0], 0, 0 );
}
if ( green > 0 ) {
ctx.globalAlpha = green / 255.0;
ctx.drawImage( rgbks[1], 0, 0 );
}
if ( blue > 0 ) {
ctx.globalAlpha = blue / 255.0;
ctx.drawImage( rgbks[2], 0, 0 );
}
return buff;
}
window.onload = function() {
var img = new Image();
img.onload = function() {
var rgbks = generateRGBKs( img );
var tintImg = generateTintImage( img, rgbks, 40, 140, 140 );
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var w = canvas.width;
var h = canvas.height;
// ctx.fillStyle = "black";
// ctx.fillRect( 0, 0, w, h );
ctx.drawImage( tintImg, 0, 0 );
}
img.src = "assets/images/my_image.jpg";
};
</script>
</head>
<body>
<canvas id="canvas" width="612" height="816">
</body>
</html>