Changing the color of multiple images in one canvas

Question

I figured it out how to change my canvas's color but I have a problem when I put more than one image in my canvas it doesn't appear. I have just one image that appears. Here is the code.

This is when I load my images in 'canvas1'

var image01 = new Image();
var image02 = new Image();
var image03 = new Image();

image01.onload = function() {
    drawImage(this, 73, 32, 249.1, 390);
    changeColor(this, 0, 0, 165, 73, 32, 249.1, 390);

    image02.onload = function() {
        drawImage(this, 1, 64, 90, 335);
        changeColor(this, 0, 0, 165, 1, 64, 90, 335);
    }
    image02.src = "images/Manches/Longue/Slim/Homme/7C5D5D2D.png";

    image03.onload = function() {
        drawImage(this, 303, 65, 90, 335);
        changeColor(this, 0, 0, 165, 303, 65, 90, 335);
    }
    image03.src = "images/Manches/Longue/Slim/Homme/7C5D5D2E.png";
};
image01.src = "images/VueDevant/Homme/Droite/658FFBC6.png";

This is the function for changing the color of my canvas
(code adapted from an answer posted by K3N ):

function changeColor(img, hue, sat, l, x, y, width, height) {

    context.clearRect(x, y, width, height);
    context.globalCompositeOperation = "source-over";
    context.drawImage(img, x, y, width, height);


    var lcombo = false;
    if (lcombo) {
        context.globalCompositeOperation = "color";
        context.fillStyle = "hsl(" + hue + "," + sat + "%, 50%)";
        context.fillRect(x, y, width, height);
        context.clearRect(x, y, width, height);
    } else {
        // adjust "lightness"
        context.globalCompositeOperation = l < 100 ? "color-burn" : "color-dodge";
        // for common slider, to produce a valid value for both directions
        l = l >= 100 ? l - 100 : 100 - (100 - l);
        context.fillStyle = "hsl(0, 50%, " + l + "%)";
        context.fillRect(x, y, width, height);
        // context.clearRect(x,y, width, height);

        // adjust saturation
        context.globalCompositeOperation = "saturation";
        context.fillStyle = "hsl(0," + sat + "%, 50%)";
        context.fillRect(x, y, width, height);
        // context.clearRect(x,y, width, height);

        // adjust hue
        context.globalCompositeOperation = "hue"; //hue
        context.fillStyle = "hsl(" + hue + ",1%, 50%)";
        // context.fillRect(x, y, width,height);
    }
    // clip
    context.globalCompositeOperation = "destination-in";
    context.drawImage(img, x, y, width, height);
    context.globalCompositeOperation = "source-over";

}

Answer 1

Because I'm not fimilar with Canvas objects and an incomplete code example from questioner, I created my own example. After that I ran step by step through each line and created so a running example:

 <html> <body> <canvas id="myCanvas" width="700" height="700" style="border: 1px solid red;"></canvas> <script type="text/javascript"> var canvas = document.getElementById('myCanvas'), context = canvas.getContext('2d'); var image01 = new Image(); var image02 = new Image(); var image03 = new Image(); image01.onload = function() { changeColor(image01, 0, 0, 165, 73, 32, 249.1, 390); image02.onload = function() { changeColor(image02, 0, 0, 165, 1, 64, 90, 335); } image02.src = "https://1.f.ix.de/scale/geometry/360x202/q75/imgs/09/2/2/5/1/1/9/7/zeroday-d774e8c5b2414e48-b0237d756e9017a9-39b755ca2936afda.jpeg"; image03.onload = function() { changeColor(image03, 0, 0, 565, 303, 65, 90, 335); } image03.src = "https://1.f.ix.de/scale/geometry/696/q75/imgs/18/2/2/5/2/1/4/1/autofly-010b77473b49efc6.jpeg"; }; image01.src = "https://1.f.ix.de/scale/geometry/336/q75/imgs/18/2/2/5/2/1/4/1/image-1499148077454426-aa28a644b6934a51.jpeg"; function changeColor(img, hue, sat, l, x, y, width, height) { context.clearRect(x, y, width, height); context.globalCompositeOperation = "source-over"; context.drawImage(img, x, y, width, height); var lcombo = false; if (lcombo) { context.globalCompositeOperation = "color"; context.fillStyle = "hsl(" + hue + "," + sat + "%, 50%)"; context.fillRect(x, y, width, height); context.clearRect(x, y, width, height); } else { context.globalCompositeOperation = l < 100 ? "color-burn" : "color-dodge"; l = l >= 100 ? l - 100 : 100 - (100 - l); context.fillStyle = "hsl(0, 50%, " + l + "%)"; context.globalCompositeOperation = "saturation"; context.fillStyle = "hsl(0," + sat + "%, 50%)"; context.fillRect(x, y, width, height); context.globalCompositeOperation = "hue"; //hue context.fillStyle = "hsl(" + hue + ",1%, 50%)"; } context.globalCompositeOperation = "destination-in"; context.globalCompositeOperation = "source-over"; } </script> </body> </html>

In my eyes the mistake was in the last three lines in function changeColor() :

context.globalCompositeOperation = "destination-in";
context.drawImage(img, x, y, width, height);
context.globalCompositeOperation = "source-over";

After I deleted the line context.drawImage(img, x, y, width, height); , all three pictures are visible (see my example).

Changing the color of multiple images in one canvas

Question

1 answers

solution1
0 2017-08-03 12:20:34

Changing the color of multiple images in one canvas

Question

1 answers

solution1 0 2017-08-03 12:20:34

solution1
0 2017-08-03 12:20:34