Take a look at this related image:
The goal is to replicate the design shown on the right side of the image. However, there's also a parent container with its own background image, as opposed to a solid color.
Any guidance on how to achieve this?
UPDATE: I should mention that compatibility across different browsers, especially Firefox, is crucial.
There's a challenging CSS solution that comes to mind, but it's quite complex.
Imagine your image is 100px wide. You would need to create a div that is also 100px wide and populate it with 100 children, each 1px wide. Each child would have the same background positioned accordingly, and their opacity would range from 0 (the first child) to .99 (the last child).
Personally, I find this method to be quite impractical and wouldn't recommend using it.
Rory O'Kane proposed a cleaner solution, and I have another idea that involves utilizing JavaScript.
The concept revolves around using a canvas element (check browser support here), drawing your image onto it, looping through its pixels, and adjusting the alpha value for each pixel.
(Scroll down to view the outcome)
Here's the relevant HTML:
<div class='parent'>
<canvas id='c' width='575' height='431'></canvas>
</div>
And relevant CSS (setting the background image on the parent):
.parent {
background: url(parent-background.jpg);
}
Now, here's the JavaScript snippet:
window.onload = function() {
var c = document.getElementById('c'),
ctxt = c.getContext('2d'),
img = new Image();
img.onload = function() {
ctxt.drawImage(img, 0, 0);
var imageData = ctxt.getImageData(0, 0, 575, 431);
for(var i = 0, n = imageData.data.length; i < n; i += 4) {
imageData.data[i + 3] = 255*((i/4)%575)/575;
}
ctxt.putImageData(imageData, 0, 0);
};
/* Images drawn onto the canvas must be hosted on the same web server
with the same domain as the executing code */
/* Alternatively, they can be encoded similarly to the demo */
img.src = 'image-drawn-on-canvas.jpg';
};
One way to achieve a transparent gradient on an image without relying solely on CSS is by converting it to a PNG format with the gradient included in its alpha channel. Most browsers fully support PNG transparency, except for outdated versions of Internet Explorer (IE 6 and below). To see the effect, you can compare how your sample image would appear with a transparent gradient as a PNG against different backgrounds.
If the images are submitted by users and you are unable to pre-add the gradient, you could consider generating and saving a version of each image with the gradient at the time of upload.
Using CSS exclusively:
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