渐变混合多个图像

Question

如何使用 CSS 使多个图像仅在特定区域相互渐变，如下图所示？

我尝试过的：

.container {
  position: relative;
  display: flex;
  height: 200px;
}

.container:before {
  content: '';
  position: absolute;
  width: 80px;
  top: 0;
  bottom: 0;
  right: 50%;
  margin-right: -40px;
  background: url(https://www.w3schools.com/w3css/img_fjords.jpg);
  filter: blur(5px);
  -webkit-filter: blur(5px);
}

.container > div {
  flex: 1;
  background-size: 100% 100%;
}

<div class="container">
  <div style="backgroud-image:url(https://www.w3schools.com/w3css/img_fjords.jpg)"></div>
  <div style="background-image:url(https://www.w3schools.com/w3css/img_fjords.jpg)"></div>
</div>

但是，如下图所示，背景图像没有褪色/过渡：

更新

我的问题没有得到任何可靠的答案，但这段代码似乎是迄今为止我能得到的最接近的答案。

对PEN BY Peter Ramsing的修改

<div class="hero-image">
  <img src="http://static.peter.coffee/codepen-assets/keyboard-background.jpg" />
</div>
<div class="hero-before">
  <img src="http://static.peter.coffee/codepen-assets/keyboard-background.jpg" />
</div>

<style>
img {
  /*  To contain the image to the confines of the div  */
  max-width: 100%;
}

.hero-image {
  max-width: 100%; 
  width: 800px;
  margin: auto;
 }
.hero-before {
  max-width: 100%; 
  width: 800px;
  margin: auto;
}

.hero-image::after {
  display: block;
  position: relative;
  background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0, #fff 100%);
  margin-top: -50px;
  height: 40px;
  width: 100%;
  content: '';
}
.hero-before::after {
  display: block;
  position: relative;
  background-image: linear-gradient(to bottom, #fff 0%, rgba(255, 255, 255, 0) 100%);
  margin-top: -345px;
  height: 50px;
  width: 100%;
  content: '';
}
</style>

Answer 1

您可以在两张图片之间使用一些伪元素并在其上应用线性渐变。通过使用相同的颜色，您将创建此效果。您可能会注意到该解决方案可以使用 background color 和 backround image，您只需要尊重背景中使用的颜色并将它们应用于伪元素即可。

这里是一个例子，你可以根据需要调整伪元素的宽度：

.container {
  position: relative;
  display: flex;
  min-height: 100px;
  margin-bottom:20px;
}

.container:before {
  content: '';
  position: absolute;
  width: 80px;
  top: 0;
  bottom: 0;
  right: 50%;
  margin-right: -40px;
  background: linear-gradient(to right, #c3986b, #0a4b67);
}

.container>div {
  flex: 1;
  background-size:100% 100%;
}

<div class="container">
  <div style="background:#c3986b;"></div>
  <div style="background:#0a4b67;"></div>
</div>

<div class="container">
  <div style="background-image:url(https://dummyimage.com/150x100/c3986b/14151a)"></div>
  <div style="background-image:url(https://dummyimage.com/150x100/0a4b67/14151a)"></div>
</div>

这是另一个带有面具的想法，适用于任何类型的图像

.container {
  display: flex;
  min-height: 300px;
  margin-bottom:20px;
}


.container>div {
  flex: 1;
  background-size:0 0;
  position:relative;
  z-index:-1;
}
.container>div::before {
  content:"";
  position:absolute;
  background-image:inherit;
  background-size:cover;
  background-position:center;
  z-index:-1;
  top:0;
  bottom:0;
}
.container>div:first-child::before {
  left:0;
  right:-50px;
  -webkit-mask:linear-gradient(to left,transparent ,#fff 50px);
          mask:linear-gradient(to left,transparent ,#fff 50px);
}
.container>div:last-child::before {
  right:0;
  left:-50px;
  -webkit-mask:linear-gradient(to right,transparent ,#fff 50px);
          mask:linear-gradient(to right,transparent ,#fff 50px);
}

<div class="container">
  <div style="background-image:url(https://picsum.photos/id/1074/800/800.jpg)"></div>
  <div style="background-image:url(https://picsum.photos/id/1060/800/800.jpg)"></div>
</div>

<div class="container">
  <div style="background-image:url(https://picsum.photos/id/1070/800/800.jpg)"></div>
  <div style="background-image:url(https://picsum.photos/id/1062/800/800.jpg)"></div>
</div>

Answer 2

您可以将 background: linear-gradient() 与 Flexbox 结合使用，以实现如下效果：

div {
  display: flex; /* displays flex-items (children) inline */
  justify-content: space-around; /* horizontal alignment / icons are evenly distributed with equal space around them, i.e. all have equal space on both sides, that's why there are two units of space between them / you can also experiment with other values such as: "space-between", "space-evenly", "center" etc. */
  align-items: center; /* vertically centered */
  height: 100px;
  background: linear-gradient(to right, #c3986b 45%, #0a4b67 55%); /* adjust the % to your needs, the sum of both needs to evaluate to 100% */
}

img {border-radius: 50%}

<div>
  <img src="http://lorempixel.com/50/50/" alt="icon1">
  <img src="http://lorempixel.com/50/50/" alt="icon2">
</div>

在给定的示例中，我将linear-gradient() 设为父级宽度的10%。该数字是通过减去%、55% - 45% 中的两个值来计算的。

为了增加其宽度，如果需要，只需增加较大的数字并减少较小的数字，最好减少相同数量的%，例如40% / 60%，使其水平居中。为了减小它的 width，只需做相反的事情。