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Editorial Team
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Asked: 2026-05-13T08:57:55+00:00

Is there any known/simple/open-source library that provide a javascript function that will switch colored

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Is there any known/simple/open-source library that provide
a javascript function that will switch colored picture that is displayed in an html page into a black and white

That can be used in all the most used browsers (IE, FireFox, Chrome)?

I mean something like:

<html>
...
<img id="myPic" src="pic.jpg">
...
<script type="text/javascript">
function onEvent(){
  var pic = document.getElementById("myPic");
  magicFunctionToBlackAndWhite(pic);
}
</script>
</html>

looking for that magicFunctionToBlackAndWhite()

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1 Answer

  1. Editorial Team

    There’s no one solution that works across all browsers, but you can combine different solutions:

    For IE, use the following CSS: filter: Gray

    A lot of other browsers supports canvas, so you should be able to use this javascript code for that.

    Of course it should’t be too much of a hassle to make an image b/w in a serverside language such as .net, so you could always have a javascript that in principle does something like the following:

    var imgs = document.getElementsByTagName('img');
for(var i = 0; i < imgs.length; i++) {
    imgs[i].src = 'convertimage.aspx?img=' + imgs[i].src;
}

    …and then have all of the magic happening on the server.

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