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  • #361407

    there was a thread here but closed – so i set up a new one.

    you can see it here: http://www.wordpress-webdesign.org/grayscale/

    because of having some troubles with the common css Solution (filter setting grayscale) i use the code Element to implement a little jquery script.

    <script type="text/javascript"> 
    	
    	// jQuery(".graytone img").css({"display":"none");
    	
    	// On window load. This waits until images have loaded which is essential
    	jQuery(window).load(function(){
    		
    		// Fade in images so there isn't a color "pop" document load and then on window load
    		jQuery(".graytone img").animate({opacity:1},500);
    		
    		// clone image
    		jQuery('.graytone img').each(function(){
    			var el = jQuery(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 = jQuery(this);
    				el.parent().css({"width":this.width,"height":this.height});
    				el.dequeue();
    			});
    			this.src = grayscale(this.src);
    		});
    		
    		// Fade image 
    		jQuery('.graytone img').mouseover(function(){
    			jQuery(this).parent().find('img:first').stop().animate({opacity:1}, 1000);
    		})
    		jQuery('.img_grayscale').mouseout(function(){
    			jQuery(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();
        }
    	    
    </script>

    you can place it e.g before a partnerlogo element:

    with :

    here i gave to the partner logo element a custom css class : graytone
    you can find that class in the script above on line ( // jQuery(".graytone img").css({"display":"none"); )
    (how to activate the custom css for every alb element put in funktions.php : add_theme_support('avia_template_builder_custom_css');)

    there are some adjustements you can make (fade in speed, animation speed)

    #361409

    same with other elements e.g portfolio Raster etc.

    Advantage of that code Element is – you only have to insert it if you need it on the site.

    btw – i’m not a coder – the script is from: http://webdesignerwall.com/tutorials/html5-grayscale-image-hover

    but i just fit it in a form that works for us

    #361618

    Hi!

    Thank you for sharing your code Guenter! :)

    Cheers!
    Yigit

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