Table of Contents
What?
Note
Usage
Demo
pixelated
crisp-edges
Finally
参考
Home Web Front-end HTML Tutorial css属性image-redering详解_html/css_WEB-ITnose

css属性image-redering详解_html/css_WEB-ITnose

Jun 24, 2016 am 11:38 AM

What?

image-rendering作为现阶段还处于实验性质中的css属性,他的作用是在浏览器对图片进行比例缩放时,设置其缩放使用的算法,从而来得到我们最终想要的图片结果。而且这个属性可以应用于img,canvas和background-image中。

Note

由于该属性未得到所有浏览器的支持,本文直接在文章里应用该属性,所以阅读此文时请使用最新版本的浏览器

Usage

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image{   image-rendering:auto;}

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其可选的值有:

  • auto
    使用默认算法,即将图片色彩进行平滑缩放,不同的浏览器采用的算法不一,如:firefox 3.0后的gecko使用双线性插值(bilinear interpolation)算法
  • crisp-edges
    使用算法达达到在绽放时保持对比度和边缘,在加工时不平滑色彩和使用模糊
  • pixelated
    当图片放大时,单纯地去放大像素点,缩小时与auto效果一样
  • Demo

    pixelated

    我们先来放主角一!

    看到了吗?这就是主角,一个大小为2*2像素的图片……

    (图片君:你个鬼把我设计这么小,赶快把爷整大,不然削你!)

    既然大哥发话了,小弟不能不听命,分分钟给大哥加了个width:400px

    可是放大后……

    (我:大哥,这还是你吗?你怎么变得这么色彩绚烂了)

    (图片君:真是B了狗了!你对我做了什么)

    (我:大哥,这不是我的错,是浏览器对你放大时使用了默认的算法把你的色彩平滑处理了……其实,现在还是挺好看的嘛!)

    (图片君:别跟我扯犊子,给我整回来!!!!!)

    大哥一怒,我连忙加点去给大家做整容手术,在它的属性里加了image-redering:pixelated

    (我:这才是你嘛,大哥)

    (图片君:这次不错,我还是我,是颜色不一样的烟火)

    从大哥那里学到了pixelated的作用,而它在实际中的作用是怎么样的呢?

    比如我有一个内容为zhiyishou.com的二维码君,它的大小为50px*50px

    二维码君虽说不小,但是比变壮后的大哥小多了,二维码君也来找我想说整整容,变成大哥那样

    于是,我直接把它变大,成了这样:

    这……你英姿飒爽的轮廓呢?看来还是不对,思索了一下是和大哥的病一样

    我二话没说,直接把刚学会的pixelated加在了二维码君的身上

    这才是俊朗的二维码君嘛!!

    crisp-edges

    从w3c官网上请来了一位嘉宾,它来和我们演示crisp-edges的用法:

    我们把嘉宾君进行放大:

    这是嘉宾君在普通放大后的结果,即使用auto来做色彩平滑,我们试试在嘉宾君身上使用pixelated,看看会怎么样

    嘉宾君有点不耐烦了,有事要走,赶快给它加上crisp-edges看看效果(由于各个浏览器对该属性的支持还不太统一,所以得做单独配置)

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    img{    width: 400px;    image-rendering: -moz-crisp-edges;         /* Firefox */    image-rendering: -o-crisp-edges;         /* Opera */    image-rendering: -webkit-optimize-contrast;/* Webkit (non-standard naming) */    image-rendering: crisp-edges;    -ms-interpolation-mode: nearest-neighbor;  /* IE (non-standard property) */}

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    可以看出来嘉宾君的边缘没有像第一次那样被平滑掉,尽可能保持自己的边缘,但是整个图片做了模糊处理,所以不像上面的pixelated一样棱角分明。

    这个效果可以对图片缩放时进行效果的优化,但和pixelated的应用场景不一样。

    Finally

    我感觉这个属性最实用的还是pixelated,对于这个属性的使用,我们不能去绝对地依赖它来实现某种效果,只能说是用它去做优化,要做到有它的参与更好,没有也不差什么,因为这个属性太新了,在chrome中出现也是chrome41,而且chrome目前还不支持crisp-edges值

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    Chrome     |   ? 41+Safari     |   * 7.1+Firefox    |   * 35+Opera      |     28+IE         |     NopeAndroid    |     NopeiOS        |   * 7.1+? Supports pixelated but not crisp-edges* Supports crisp-edges but not pixelated

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    参考

    image-rendering on MDN
    image-rendering on W3C
    image-rendering article

    Finish.

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