Introduction to the filter attribute in CSS that defines the visual effects of elements

The content of this article is an introduction to the visual effects of elements defined by the filter attribute in CSS. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

blur

• Set a 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 blurrier it is.

• If no value is set, the default is 0; this parameter can set the css length value, but does not accept percentage values.

brightness

• Apply a A linear multiplication that makes it appear lighter 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.

graycale

• Convert image to Grayscale image. The value defines the scale of the conversion. If the value is 100%, the image is 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;

##hue-rotate

• Apply hue rotation to the image. The "angle" value sets the angle of the color circle by which the image will be adjusted. If the value is 0deg, there will be no change in the image. If the value is not set, the default value is 0deg. Although this value does not have a maximum value, a value exceeding 360deg is equivalent to going around again.

##invert

Invert the input image . The value defines the scale of the conversion. 100% of the value is a complete reversal. A value of 0% means there is no change in the image. Values ​​between 0% and 100% are linear multipliers of the effect. If the value is not set, the value defaults to 0.

opacity

Convert the transparency of the image degree. The value defines the scale of the conversion. A value of 0% means complete transparency, a value of 100% means no change to the image. Values ​​between 0% and 100% are linear multipliers of the effect, equivalent to multiplying the number of image samples. If the value is not set, the value defaults to 1. This function is very similar to the existing opacity attribute, except that through filter, some browsers provide hardware acceleration to improve performance.

##saturate

Convert image saturation . The value defines the scale of the conversion. A value of 0% means the image is completely desaturated, and a value of 100% means the image has no change. Other values ​​are linear multipliers of the effect. Values ​​above 100% are allowed, with higher saturation. If the value is not set, the value defaults to 1.

sepia

Convert image to Dark brown. The value defines the scale of the conversion. A value of 100% is completely sepia, and a value of 0% leaves the image unchanged. Values ​​between 0% and 100% are linear multipliers of the effect. If not set, the value defaults to 0;

##drop-shadow

• Set a shadow effect to the image. Shadows are composited underneath the image and can be blurred, offset versions of the matte that can be painted in a specific color. The function accepts values ​​of type (defined in the CSS3 context), except that the "inset" keyword is not allowed. This function is very similar to the existing box-shadow box-shadow property; the difference is that through the filter, some browsers provide hardware acceleration for better performance.

nbsp;html>



    <meta>
    <meta>
    <meta>
    <title>Document</title>

<style>
    body {
        background-color: #000;
        color: skyblue;
    }
    div {
        border: 1px solid #fff;
        padding: 10px;
        width: 610px;
        margin: 10px;
    }
    .blur1 {
        filter: blur(0.4px);
    }

    .blur2 {
        filter: blur(1px);
    }

    .blur3 {
        filter: blur(4px);
    }

    .brightness1 {
        filter: brightness(0.30);
    }

    .brightness2 {
        filter: brightness(0.8);
    }

    .brightness3 {
        filter: brightness(1);
    }

    .contrast1 {
        filter: contrast(10%);
    }

    .contrast2 {
        filter: contrast(50%);
    }

    .contrast3 {
        filter: contrast(100%);
    }

    .grayscale1 {
        filter: grayscale(10%);
    }

    .grayscale2 {
        filter: grayscale(50%);
    }

    .grayscale3 {
        filter: grayscale(100%);
    }

    .huerotate1 {
        filter: hue-rotate(0deg);
    }

    .huerotate2 {
        filter: hue-rotate(90deg);
    }

    .huerotate3 {
        filter: hue-rotate(180deg);
    }

    .invert1 {
        filter: invert(20%);
    }

    .invert2 {
        filter: invert(60%);
    }

    .invert3 {
        filter: invert(100%);
    }

    .opacity1 {
        filter: opacity(10%);
    }

    .opacity2 {
        filter: opacity(80%);
    }

    .opacity3 {
        filter: opacity(100%);
    }

    .saturate1 {
        filter: saturate(0.2);
    }

    .saturate2 {
        filter: saturate(0.6);
    }

    .saturate3 {
        filter: saturate(1);
    }

    .sepia1 {
        filter: sepia(10%);
    }

    .sepia2 {
        filter: sepia(60%);
    }

    .sepia3 {
        filter: sepia(100%);
    }

    .shadow1 {
        filter: drop-shadow(2px 2px 2px red);
    }

    .shadow2 {
        filter: drop-shadow(8px 8px 1px purple);
    }

    .shadow3 {
        filter: drop-shadow(1px 1px 10px hotpink);
    }
</style>


    <div>
        <p>给图像绘制高斯模糊，值越大越模糊</p>
        <ul>
            <li>blur</li>
            <li>blur</li>
            <li>blur</li>
        </ul>
    </div>
    <div>
        <p>给图像一种线性乘法使看起来更亮或者更暗。值为0图像全黑；值超过100%图像更亮</p>
        <ul>
            <li>brightness</li>
            <li>brightness</li>
            <li>brightness</li>
        </ul>
    </div>
    <div>
        <p>调整图像对比度。值为0，图像全黑；值超过100%会运用更低的对比</p>
        <ul>
            <li>contrast</li>
            <li>contrast</li>
            <li>contrast</li>
        </ul>
    </div>
    <!-- <div>
        <p>blur</p>
        <ul>
            <li>blur</li>
            <li>blur</li>
            <li>blur</li>
        </ul>
    </div> -->
    <div>
        <p>图像转换为灰度图像，值为0图像无变化；值为100%完全转换为灰度图像</p>
        <ul>
            <li>grayscale</li>
            <li>grayscale</li>
            <li>grayscale</li>
        </ul>
    </div>
    <div>
        <p>给图像用色相旋转。值为0deg图像无变化；没有最大值，超过360deg相当于又绕一圈</p>
        <ul>
            <li>huerotate</li>
            <li>huerotate</li>
            <li>huerotate</li>
        </ul>
    </div>
    <div>
        <p>反转输入图像。0%图像无变化，100%图像完全反转</p>
        <ul>
            <li>invert</li>
            <li>invert</li>
            <li>invert</li>
        </ul>
    </div>
    <div>
        <p>转化图像的透明度。0%，完全透明；100%图像无变化</p>
        <ul>
            <li>opacity</li>
            <li>opacity</li>
            <li>opacity</li>
        </ul>
    </div>
    <div>
        <p>转换图像饱和度。0%完全不饱和；100%，完全饱和</p>
        <ul>
            <li>saturate</li>
            <li>saturate</li>
            <li>saturate</li>
        </ul>
    </div>
    <div>
        <p>图像转换为深褐色。值为100%为深褐色；值为0%图像无变化</p>
        <ul>
            <li>sepia</li>
            <li>sepia</li>
            <li>sepia</li>
        </ul>
    </div>
    <div>
        <p>图像设置阴影效果</p>
        <ul>
            <li>shadow</li>
            <li>shadow</li>
            <li>shadow</li>
        </ul>
    </div>

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