How to set the transparency of images in css

In web design, the transparency of images is a very important visual effect. By setting transparency, we can make the picture blend into the background more naturally, making the content more layered and interesting. So, how to set image transparency in CSS?

Method 1: Use RGBA color format

In CSS, we can use RGBA color format to set image transparency. The RGBA format is a color model, which consists of red (Red), green (Green), blue (Blue), and Alpha channel (Alpha channel), where the alpha channel is used to control the transparency of the color.

In CSS, we can use the RGBA format in the background-color or color attribute to set the color transparency, for example:

background-color: rgba(255, 255, 255, 0.5) ;

Among them, the last parameter 0.5 represents the transparency of the color. The smaller the value, the more transparent the color.

If we want to make the picture translucent, we only need to set the background color to an RGBA color with low transparency, for example:

background-color: rgba(255, 255, 255 , 0.5);

Apply this attribute to the image, and the transparency of the image will change according to the background color set by the container in which it is located. For example:

Method 2: Use opacity Properties

In addition to the RGBA color format, CSS also provides an opacity property to control the transparency of elements. This attribute can be applied to images or any other element. For example:

After setting like this, the image will be displayed semi-transparently. Compared with method one, the advantage of using the opacity attribute is that you can change the transparency of the entire element at the same time, not just the background color.

It should be noted that when using the opacity attribute, you need to note that it will affect the transparency of elements inside the element. For example, if the opacity is set to 0.5 in a div container, all elements inside the container will have a transparency of 0.5, unless the RGBA color format is used for local adjustment.

Conclusion

When designing web pages, it is a very common method to use image transparency to enhance visual effects. Both methods can achieve this purpose. For daily use, sometimes you should consider choosing a simple operation method for better results; but if you want to specifically combine the picture effects, you need to go to RGBA and set each picture separately as needed. When formulating CSS style rules, the choice of transparency needs to be fully considered and a method better suited to the website should be selected.

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