Convert an image to grayscale in HTML/CSS-第2页回答

Is there a simple way to display a color bitmap in grayscale with just HTML/CSS?

It doesn't need to be IE-compatible (and I imagine it won't be) -- if it works in FF3 and/or Sf3, that's good enough for me.

I know I can do it with both SVG and Canvas, but that seems like a lot of work right now.

Is there a truly lazy person's way to do this?

标签： css image css3 grayscale

26条回答

妖精总统

2楼-- · 2018-12-31 10:46

Simplest way to achieve grayscale with CSS exclusively is via the filter property.

img {
    -webkit-filter: grayscale(100%); /* Safari 6.0 - 9.0 */
    filter: grayscale(100%);
}

The property is still not fully supported and still requires the -webkit-filter property for support across all browsers.

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不再属于我。

3楼-- · 2018-12-31 10:48

For people who are asking about the ignored IE10+ support in other answers, checkout this piece of CSS:

img.grayscale:hover {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0, 0 1 0 0 0, 0 0 1 0 0, 0 0 0 1 0\'/></filter></svg>#grayscale");
}

svg {
    background:url(http://4.bp.blogspot.com/-IzPWLqY4gJ0/T01CPzNb1KI/AAAAAAAACgA/_8uyj68QhFE/s400/a2cf7051-5952-4b39-aca3-4481976cb242.jpg);
}

svg image:hover {
    opacity: 0;
}

Applied on this markup:

<!DOCTYPE HTML>
<html>
<head>

    <title>Grayscaling in Internet Explorer 10+</title>

</head>
<body>

    <p>IE10 with inline SVG</p>
    <svg xmlns="http://www.w3.org/2000/svg" id="svgroot" viewBox="0 0 400 377" width="400" height="377">
      <defs>
         <filter id="filtersPicture">
           <feComposite result="inputTo_38" in="SourceGraphic" in2="SourceGraphic" operator="arithmetic" k1="0" k2="1" k3="0" k4="0" />
           <feColorMatrix id="filter_38" type="saturate" values="0" data-filterid="38" />
        </filter>
      </defs>
      <image filter="url(&quot;#filtersPicture&quot;)" x="0" y="0" width="400" height="377" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://4.bp.blogspot.com/-IzPWLqY4gJ0/T01CPzNb1KI/AAAAAAAACgA/_8uyj68QhFE/s1600/a2cf7051-5952-4b39-aca3-4481976cb242.jpg" />
    </svg>

</body>
</html>

For more demos, checkout IE testdrive's CSS3 Graphics section and this old IE blog http://blogs.msdn.com/b/ie/archive/2011/10/14/svg-filter-effects-in-ie10.aspx

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笑指拈花

4楼-- · 2018-12-31 10:48

Here's a mixin for LESS that will let you choose any opacity. Fill in the variables yourself for plain CSS at different percentages.

Neat hint here, it uses the saturate type for the matrix so you don't need to do anything fancy to change the percentage.

.saturate(@value:0) {
    @percent: percentage(@value);

    filter: url("data:image/svg+xml;utf8,<svg%20xmlns='http://www.w3.org/2000/svg'><filter%20id='grayscale'><feColorMatrix%20type='saturate'%20values='@value'/></filter></svg>#grayscale"); /* Firefox 3.5+ */
    filter: grayscale(@percent); /* Current draft standard */
    -webkit-filter: grayscale(@percent); /* New WebKit */
    -moz-filter: grayscale(@percent);
    -ms-filter: grayscale(@percent);
    -o-filter: grayscale(@percent);
}

Then use it:

img.desaturate {
    transition: all 0.2s linear;
    .saturate(0);
    &:hover {
        .saturate(1);
    }
}

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怪性笑人.

5楼-- · 2018-12-31 10:50

You don't need use so many prefixes for full use, because if you choose prefix for old firefox, you don't need use prefix for new firefox.

So for full use, enough use this code:

img.grayscale {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 10+, Firefox on Android */
    filter: gray; /* IE6-9 */
    -webkit-filter: grayscale(100%); /* Chrome 19+, Safari 6+, Safari 6+ iOS */
}

img.grayscale.disabled {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0, 0 1 0 0 0, 0 0 1 0 0, 0 0 0 1 0\'/></filter></svg>#grayscale");
    filter: none;
    -webkit-filter: grayscale(0%);
}

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栀子花@的思念

6楼-- · 2018-12-31 10:52

support for native CSS filters in webkit has been added from the current version 19.0.1084.46

so -webkit-filter: grayscale(1) will work and which is easier than SVG approach for webkit...

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不流泪的眼

7楼-- · 2018-12-31 10:53

In Internet Explorer use the filter property.

In webkit and Firefox there is currently no way to desatuarte an image solely with CSS. so you will need to use either canvas or SVG for a client side solution.

But I think using SVG is more elegant. check out my blog post for the SVG solution that works for both Firefox and webkit: http://webdev.brillout.com/2010/10/desaturate-image-without-javascript.html

And strictly speaking since SVG is HTML the solution is pure html+css :-)

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Convert an image to grayscale in HTML/CSS

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