How to set the background image grayscale in css

How to set the grayscale of the background image in css: You can use the filter attribute filter to set it, such as [filter:grayscale(100%)], which means that the image is completely converted into a grayscale image.

The operating environment of this article: windows10 system, css 3, thinkpad t480 computer.

There is a filter attribute filter in css, which defines the visual effect of the element (usually img), such as blur, saturation, grayscale, etc.

Attribute syntax:

filter: none | blur() | brightness() | contrast() | drop-shadow() | grayscale() | hue-rotate() | invert() | opacity() | saturate() | sepia() | url();

Common attribute values:

• none Default value, no effect.

• blur(px) Sets Gaussian blur to the image. The "radius" value sets the standard deviation of the Gaussian function, or how many pixels are blended together on the screen, so the larger the value, the blurr it is; if there is no set value, the default is 0; this parameter can set the css length value, but Percentage values ​​are not accepted.

• brightness(%) Applies a linear multiplication to the image, making it appear brighter or darker. If the value is 0%, the image will be completely black. If the value is 100%, there will be no change in the image. Other values ​​correspond to linear multiplier effects. Values ​​above 100% are okay and the image will be brighter than before. If no value is set, the default is 1.

• contrast(%) Adjust the contrast of the image. If the value is 0%, the image will be completely black. The value is 100% and the image is unchanged. Values ​​can exceed 100%, meaning a lower comparison will be used. If no value is set, the default is 1.

• grayscale(%)

• Convert the image to grayscale. The value defines the scale of the conversion. If the value is 100%, the image will be completely converted to grayscale, and if the value is 0%, the image will remain unchanged. Values ​​between 0% and 100% are linear multipliers of the effect. If not set, the value defaults to 0;

Example 1:

图片转为黑白色:



注意: Internet Explorer 或 Safari 5.1 (及更早版本) 不支持该属性。

Running result:

Example 2:

图片使用高斯模糊效果:



注意： Internet Explorer 不支持 filter 属性。

Running results:

(Learning video sharing: css video tutorial)

Example 3 :

给图像设置一个阴影效果:



注意： Internet Explorer 不支持 filter 属性。

Running results:

Related recommendations: CSS tutorial

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