Hello everyone, I am Akanksha Gupta, pursuing the best UI UX design course from ADMEC Multimedia Institute. Today I will be writing this blog on topic assigned to me that is – Difference Between Opacity and Alpha in CSS3.
Let’s start….
First , we will understand what is CSS3?
CSS3 (Cascading Style Sheet), is the most significant language in the web development process. It helps in adding flexibility, interactivity in the design to make the website look more attractive and helps in creating a long-lasting impression on users.
It provides end number of properties/functions for different page layout designs, adjusting colours, font in them and adding effects to images, text etc. The basic and the most foremost need of any web designing is to decide the most attractive colour layouts and in this transparent colour is the most important and unique feature in CSS3 that makes background elements visible from different page’s top element. We can make use of transparent color on any of the element.
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Overview of opacity and alpha in CSS3
We use mainly have two elements that help us in changing the transparency in CSS. These are Alpha and Opacity. Let’s know more about them.
Opacity
The opacity is one of the most useful properties of CSS3, it permits us to instantly set the transparency value of an element. The amount of transparency varies from 0 (fully opaque) to 1 (fully transparent). For example, if we want transparency level to 50% , then we have to set the opacity value to 0.5px.
For eg.
p {background-color: #7cb01e; opacity: 0.4; }
Alpha [RGBA]
RGBA is a new feature that was being introduced in CSS3 , it stands for Red Blue Green Alpha. If a pixel having 0% value in its alpha channel(fully transparent - invisible), on the other hand a pixel having 100% in its alpha channel (fully opaque).
For eg.
p {background-color :rgba (0,0,255,0.3); }
Major differences between RGBA and Opacity
Both RGBA and Opacity properties share common function which is mainly related to controlling the transparency of an element, but still, they aren’t the same thing.
So, now we will find out the difference between the two.
- When we mention an opacity value to a main element, the opacity value mentioned is taken by all of its child elements in it.
- On the other hand, RGBA sets the opacity of the color value to the particular element in which it is mentioned, and therefore the transparency will not be taken by its other remaining elements mentioned in it. In short, RGBA sets the opacity value only to a specific element in which it is mentioned.
Now the most important question that comes in a designer/developer’s mind is :
Which one is better to use - Opacity or RGBA?
As I mentioned above, that both are not the same thing. Therefore, to decide which one is better to use completely depends on one’s requirement of the opacity level.
I hope this is useful for you.
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