Want to create a simple image brightness control slider

Question

I wanted to implement a slider control that changes the brightness of the image, much like the one shown at this link :

http://camanjs.com/examples/

I am fa

Answer 1

You can achieve the desired effect with a canvas element, CSS3 filter and pure JavaScript:

HTML

JavaScript

window.onload = function () {
    var context = document.getElementById('img').getContext('2d');

    /* Loading the image at first */
    var base_image = new Image();
    base_image.src = 'http://images.google.com/intl/fr_ALL/images/logos/images_logo_lg.gif';
    context.drawImage(base_image, 0, 0);

    /* Function trigerred when we leave the input */
    document.getElementById('bri').onblur = function () {
        var amount = this.value;

        var img = document.getElementById('img');

        /* We change the brightness of the canvas itself */
        img.setAttribute('style', 'filter:brightness(' + amount + '); -webkit-filter:brightness(' + amount + '); -moz-filter:brightness(' + amount + ')');

    }
};

Live Demo