未捕获的错误：INDEX_SIZE_ERR：DOM异常1，getImageData

Question

I am using following code to convert my image into grey scale, on local machine it is fine but when I deploy the same on server it passes Uncaught Error: INDEX_SIZE_ERR: DOM Exception 1 I wonder is it due to different domain, I am not sure but problem is due to "getImageData". Also, this problem is only on chrome.

I have read lot of posts and tried a lot, but seems like nothing working for me.

Thanks in Advance...

function grayscale(img) {
         var canvas = document.createElement('canvas');
         var ctx = canvas.getContext('2d');
         var imgObj = new Image();
         imgObj.src = img;
         canvas.width = imgObj.width;
         canvas.height = imgObj.height;
         ctx.drawImage(imgObj, 0, 0);
         var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
         for (var y = 0; y < imgPixels.height; y++) {
         for (var x = 0; x < imgPixels.width; x++) {
         var i = (y * 4) * imgPixels.width + x * 4;
         var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2]) / 3;
                    imgPixels.data[i] = avg;
                    imgPixels.data[i + 1] = avg;
                    imgPixels.data[i + 2] = avg;
                }
            }
            ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
            return canvas.toDataURL();
        }

Answer 1

This works fine for me

// img is HTMLImageElement
function makeGreyScale(img) {
  var canvas = document.createElement('canvas');
  var ctx = canvas.getContext('2d');
  var imgObj = new Image();
  imgObj.src = img.src;
  imgObj.onload = function(){
    canvas.width = imgObj.width;
    canvas.height = imgObj.height;
    ctx.drawImage(imgObj, 0, 0);
    var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);

    for(var y = 0; y < imgPixels.height; y++){
      for(var x = 0; x < imgPixels.width; x++){
        var i = (y * 4) * imgPixels.width + x * 4;
        var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2]) / 3;
        imgPixels.data[i] = avg;
        imgPixels.data[i + 1] = avg;
        imgPixels.data[i + 2] = avg;
      }
    }
    ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
    img.src= canvas.toDataURL();
  };
}

Answer 2

Most likely you are not calling the script using window.load and rather using on DOM load. I ran into the same problem using the grayscale script. Here's the code that works for me:

$(window).load(function(){

    imageColorize();
});


//Black and white images to color
function imageColorize(){

    // Fade in images so there isn't a color "pop" document load and then on window load
    $(".colorize img").fadeIn(500);

    // clone image
    $('.colorize img').each(function(){
        var el = $(this);
        el.css({"position":"absolute"}).wrap("<div class='img_wrapper' style='display: inline-block'>").clone().addClass('img_grayscale').css({"position":"absolute","z-index":"998","opacity":"0"}).insertBefore(el).queue(function(){
            var el = $(this);
            el.parent().css({"width":this.width,"height":this.height});
            el.dequeue();
        });
        this.src = grayscale(this.src);
    });

    // Fade image
    $('.colorize img').mouseover(function(){
        $(this).parent().find('img:first').stop().animate({opacity:1}, 1000);
    });
    $('.colorize .img_grayscale').mouseout(function(){
        $(this).stop().animate({opacity:0}, 1000);
    });

}

// Grayscale w canvas method
function grayscale(src){
    var canvas = document.createElement('canvas');
    var ctx = canvas.getContext('2d');
    var imgObj = new Image();
    imgObj.src = src;
    canvas.width = imgObj.width;
    canvas.height = imgObj.height;
    ctx.drawImage(imgObj, 0, 0);
    var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
    for(var y = 0; y < imgPixels.height; y++){
        for(var x = 0; x < imgPixels.width; x++){
            var i = (y * 4) * imgPixels.width + x * 4;
            var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2]) / 3;
            imgPixels.data[i] = avg;
            imgPixels.data[i + 1] = avg;
            imgPixels.data[i + 2] = avg;
        }
    }
    ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
    return canvas.toDataURL();
}

Answer 3

I just had similar issue in IE9, IE10.

I would suggest using, in your case ( creating image object dynamically ):

imgObj.naturalWidth;
imgObj.naturalHeight;

instead of

imgObj.width;
imgObj.height;