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How to convert image to grayscale? A very easy, use a grayscale Photoshop filter, this solution gives a very good result. But if you want to convert grayscale image on the web-based applications, how should we do? It's still a filter, because Adobe has released an online tool for editing pictures, or some other image editors.

But this is not a topic [email protected] want to discuss. [email protected]'s talking about a color grayscale image converter with JavaScript, a free simple JavaScript example code to convert grayscale on your web pages directly.

Check out this free JavaScript example code to learn how to desaturate an image (convert color images to grayscale) using JavaScript.

Label: How to grayscale, convert grayscale, grayscale image, color grayscale, grayscale Photoshop, Photoshop filter, Photoshop, web-based application, online tool, Adobe

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<script type="text/javascript" src="/javascript/jquery.js"></script>
<script type="text/javascript">
    $(document).ready(function(){
        $('#toggleDesaturate').click(function(){
            var imgObj = document.getElementById('image');
            
            if($.browser.msie){
                grayscaleImageIE(imgObj);
            } else {
                imgObj.src = grayscaleImage(imgObj);
            }           
        });
    });

    function grayscaleImageIE(imgObj)
    {
        imgObj.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(grayScale=1)';
    }

    function grayscaleImage(imgObj)
    {
        var canvas = document.createElement('canvas');
        var canvasContext = canvas.getContext('2d');
        
        var imgW = imgObj.width;
        var imgH = imgObj.height;
        canvas.width = imgW;
        canvas.height = imgH;
        
        canvasContext.drawImage(imgObj, 0, 0);
        var imgPixels = canvasContext.getImageData(0, 0, imgW, imgH);
        
        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;
            }
        }
        
        canvasContext.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
        return canvas.toDataURL();
    }
</script>

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<p>Click the button below the image to desaturate it.</p>
        
        <div>
            <p>
                <strong>Original image:</strong><br/>
                <img src="nature-1.jpg" alt="" />

            </p>           
            <p>
                <strong>Image which will be desaturated:</strong><br/>
	            <img src="nature-1.jpg" alt="" id="image" />
            </p>           
        </div>
        <form><button id="toggleDesaturate" type="button">Desaturate Image</button></form>

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19/11/2010
Mufti Ali [more]
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Color Grayscale Image Converter with JavaScript - JID: 2487 - Language: English

0/5 0 votes / 8,751 previews / 0 comment 19/11/2010 How to convert image to grayscale? A very easy, use a grayscale Photoshop filter,...Color Grayscale Image Converter with JavaScript - JID: 2487 - Color Grayscale Image Converter with JavaScript - Language: English

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