Maximizing CSS opacity for optimal performance in image fading

I'm working on creating a smooth fade in-out effect for the images in my photo gallery by adjusting the CSS opacity value using JavaScript. However, I've noticed that this process is quite sluggish on certain computers, such as my relatively new but not very powerful laptop (Asus Eeepc).

After seeing demos of Canvas animation and HTML5 being used for image effects that are much more fluid on my laptop, I'm curious if there's a way to apply this same level of performance to my fading feature.

Does anyone have any suggestions or ideas on how I can address this performance issue and improve the speed of the image transitions?

Answer №1

Here is a quick example I put together demonstrating an image fading effect using the canvas tag as requested: http://jsfiddle.net/6wmrd/12/ (Tested only in Chrome and Firefox)

I cannot guarantee any performance improvements, but this simple example shows how it can be achieved. Keep in mind that this was created hastily, so there is room for code optimization.

In my experience, fading an element with the same background color as the image behind it can sometimes result in smoother transitions.

To enhance performance, consider lowering the FPS. MooTools typically uses 50 FPS by default, but reducing this might impact perceived smoothness.

Answer №2

Below is a piece of code that is compatible with all browsers: add the following to your head section:

/*  ****************************
    * updated for cross-browser compatibility by 
    * Evan Neumann from Orbiting Eden on 
    * October 6, 2011.      
    * www.orbitingeden.com - <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f09586919eb09f82929984999e979594959ede939f9d">[email protected]</a>
    * initial version only functioned on IE
    *****************************/
<!-- Begin
    /*  *****************************
     *  * customizable by user
     *  ***************************/
    var slideShowSpeed      = 5000; // Set slide show speed (in milliseconds) shared across all browswers
    var crossFadeDuration   = 5;    // Duration of crossfade (0.1 second) shared across all browsers
    var crossFadeIncrement  = .05;  //crossfade step amount (1 is opaque) for non-IE browsers

    // Specify the image files
var Pic = new Array();      // do not modify this line
// to add more images, continue the pattern below in the array
Pic[0] = 'images/dare2wear-427ED-e.jpg';        
Pic[1] = 'images/PBW_3238EDSM-e.jpg';           
Pic[2] = 'images/dare2wear-441_2ED-e.jpg';      

/*  ********************************
    * do not change anything below this line
    **********************************/
var f = 0;          //index of the foreground picture
var b = 1;          //index of the background picture
var p = Pic.length; //number of pictures loaded in queue - may increase as time goes on depending on number and size of pictures and network speed

//load the picture URLs into an image object array
//used to control image download and for IE shortcut
var preLoad = new Array();
for (i = 0; i < p; i++) { 
    preLoad[i] = new Image();
    preLoad[i].src = Pic[i];
}

function runSlideShow() {//this gets triggered by <body onload="runSlideShow()" > 
    //if IE, use alternate method
    if (document.all) {
        document.images.SlideShow.style.filter="blendTrans(duration=2)";
        document.images.SlideShow.style.filter="blendTrans(duration=crossFadeDuration)";
        document.images.SlideShow.filters.blendTrans.Apply();
    }

    //increment the foreground image source
    document.images.SlideShow.src = preLoad[f].src;

    //if IE, use the shortcut
    if(document.all) {
        document.images.SlideShow.filters.blendTrans.Play();
    }
    //all other browser use opacity cycling
    else    {
        var imageContainer  = document.getElementById('imageContainer');
        var image           = document.images.SlideShow;
        //convert an integer to a textual number for stylesheets
        imageContainer.style.background = "url('"+Pic[b]+"')";
        //set opacity to fully opaque (not transparent)
        image.style.opacity = 1;
        //run fade out function to expose background image
        fadeOut();
    }

    //increment picture index
    f++;
    //if you have reached the last picture, start again at 0
    if (f > (p - 1)) f = 0;
    //set the background image index (b) one ahead of foreground image
    b = f+1;
    //if b exceeds number of pictures, reset to zero
    if(b >= p)  {b = 0;}

    //call this function recursively indefinitely
    setTimeout('runSlideShow()', slideShowSpeed);
}

function fadeOut(){
    //convert to element
    var el = document.images.SlideShow;

    //decrement opacity by 1/20th or 5%
    el.style.opacity = el.style.opacity - crossFadeIncrement;
    //if opacity is less than 5%, move on to next picture
    if(el.style.opacity <= crossFadeIncrement)  {
        return; 
    }
    //wait 50 milliseconds before decrementing another 5% in opacity
    setTimeout('fadeOut()', crossFadeDuration*10);
}
//  End -->

and insert two elements into the body. The first being a container background element. A div is used here, but td, body, and others should also work fine. The second is the foreground image. Finally, within the <body> tag, include the onload function call

  <body onLoad="runSlideShow()">
      <!-- main image background-->
      <div id="imageContainer">
        <!-- main image foreground -->
        <img id="SlideShow" name='SlideShow' width="324" height="486">
      </div>

Answer №3

If you want to speed up your website, consider utilizing hardware acceleration and webkit transforms. However, keep in mind that not all browsers fully support these features yet. Check out this link for more information:

Hopefully, in the near future, browser support for hardware acceleration will improve.

Answer №4

Take a peek at the homepage of this website. It features 5 images that transition in and out seamlessly, using only css2, html4, and javascript. This design is compatible with all major web browsers (to the best of my knowledge). Although the javascript code may be a bit outdated, it still runs smoothly. Test it on your device and if there are any delays, consider adjusting the update frequency to 150 or 200ms instead of 100.

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