How to set image transparency in css

CSS is a style sheet language used for web design and development. There are many attributes that can make web page elements present different styles. One of them is to set the transparency of the image. Let's introduce how to set the transparency of the image through CSS.

1. Transparency attribute

In CSS, you can use the opacity attribute to set the transparency of an image. This property can accept a value between 0 and 1, where 0 means completely transparent and 1 means completely opaque. For example, to set the transparency of an image to 0.5, the code is as follows:

img {
  opacity: 0.5;
}

The above code will set all img tags to semi-transparent.

2. RGBA color value

You can also use RGBA color value to set the transparency of the image. RGBA color values ​​contain four values, namely red, green, blue and transparency. For example, to set the transparency of an image to 0.5, the code is as follows:

img {
  background-color: rgba(255, 255, 255, 0.5);
}

The above code will set the background color of all img tags to white and semi-transparent.

3. Picture Mask

You can also use picture mask to achieve picture transparency. A picture mask is an image with the same size as the original picture. Different transparency effects can be achieved by setting different transparency levels on the mask. For example, to set the transparency of an image to 0.5, the code is as follows:

img {
  mask-image: url('mask.png');
}

The above code will apply an image mask named mask.png to all img tags.

In general, there are many ways to set the transparency of images through CSS, and you can choose different methods according to specific needs. At the same time, since different browsers have different compatibility with CSS properties, you need to pay attention to browser compatibility issues when using CSS to set image transparency.

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