Is it possible to convert CSS colors to alpha in images?

A few weeks back, I came across a web page discussing the possibility of replacing color areas in an image by applying a color mask and making them transparent.

For instance, being able to make white areas transparent on an image of a logo that is placed over a white background by using a new CSS property.

I have been unsuccessful in finding more information about it; perhaps it was just someone suggesting a new feature for CSS3 or a specific vendor property.

I'm posting this here in hopes that someone familiar with this topic can shed some light on it.

cssimagehtmltransparency

Answer №1

Apologies for any confusion caused by my initial interpretation of your question.

If you're looking to accomplish this task, one approach could involve loading the image onto an HTML5 canvas, iterating through the pixels, and adjusting the alpha channel values accordingly based on the RGB components. To aid you in this process, here's a helpful resource to kickstart your journey:

Answer №2

After some searching, I discovered a method to adjust the opacity on this website: 

<img src="image.png" class="opacity30" />

In order for this to take effect, we need to include that class in our CSS file as well. Here is what it should look like...

 .opacity30 { filter:alpha(opacity=30);
 -moz-opacity:0.3;
 -khtml-opacity: 0.3; opacity: 0.3; }

UPDATE:

I stumbled upon this resource which may be useful to you. It provides instructions on how to apply an image mask to an img tag.

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