如何在不影响前景项目的情况下调整 <div> 中背景图像的亮度？

Question

先声明一下，我是 HTML 和 CSS 的菜鸟。话虽如此，我的网站的一部分有这个 JS Fiddle：https://jsfiddle.net/rharrison2641/sb3rzm9t/2/

代码。）

HTML:

<section class="FutureGoals">

  <div class="BlizzBox">

    <div class="Blizzard1">

      <img alt="BlizzPop" src="https://s8.postimg.cc/5avnnvurp/Blizz_Pop.png" class="BlizzPop">

    </div>

  </div>

</section>

CSS:

.FutureGoals {
  height: 100vh;
  overflow: hidden;
}

.BlizzBox {
  height: 100vh;
  overflow: hidden;
}

.Blizzard1 {
  background: url(https://s8.postimg.cc/g96x696k3/Blizzard.jpg);
  background-repeat: no-repeat;
  background-position: 75%;
  background-attachment: fixed;
  height: 100%;
  width: 100%;
  transition: all .5s ease;
  -moz-transition: all .5s ease;
  -ms-transition: all .5s ease;
  -webkit-transition: all .5s ease;
  -o-transition: all .5s ease;
  webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.Blizzard1:hover {
  -webkit-filter: brightness(50%);
  -moz-transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -o-transform: scale(1.1);
  -ms-transform: scale(1.1);
  transform: scale(1.1);
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand')";
  filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand');
}

.BlizzPop {
  position: relative;
  height: auto;
  width: 30%;
  left: 25%;
  top: 9%;
  z-index: 1;
  transition: all .7s ease;
  -moz-transition: all .7s ease;
  -ms-transition: all .7s ease;
  -webkit-transition: all .7s ease;
  -o-transition: all .7s ease;
}

.Blizzard1:hover .BlizzPop {
  z-index: 1;
  -moz-transform: scale(1.5);
  -webkit-transform: scale(1.5);
  -o-transform: scale(1.5);
  -ms-transform: scale(1.5);
  transform: scale(1.5);
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand')";
  filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand');
}

基本上我想做的是使背景图像变暗，Blizzard.jpg，但使 Blizzard.png 徽标不变暗并保留其白色。就目前而言，一切正常，但徽标变暗为浅灰色。我试过将图像放在背景图像 div 之外，但这只会导致 window 调整大小变得非常糟糕。有人可以为此提出解决方法吗？我已经尝试了好几天了，所以任何解决方案或帮助都将不胜感激。

Answer 1

您可以将 rgba() 渐变悬停在 background-image 上使其变暗。

background: 
     linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),/* the gradient on top, adjust color and opacity to your taste */
      url(https://s8.postimg.cc/g96x696k3/Blizzard.jpg);

下面的演示

.FutureGoals {
  height: 100vh;
  overflow: hidden;
}

.BlizzBox {
  height: 100vh;
  overflow: hidden;
}

.Blizzard1 {
  background: url(https://s8.postimg.cc/g96x696k3/Blizzard.jpg);
  background-repeat: no-repeat;
  background-position: 75%;
  background-attachment: fixed;
  height: 100%;
  width: 100%;
  transition: all .5s ease;
  -moz-transition: all .5s ease;
  -ms-transition: all .5s ease;
  -webkit-transition: all .5s ease;
  -o-transition: all .5s ease;
  webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.Blizzard1:hover {
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url(https://s8.postimg.cc/g96x696k3/Blizzard.jpg);
  background-repeat: no-repeat;
  background-position: 75%;
  background-attachment: fixed;
  webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  -moz-transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -o-transform: scale(1.1);
  -ms-transform: scale(1.1);
  transform: scale(1.1);
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand')";
  filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand');
}

.BlizzPop {
  position: relative;
  height: auto;
  width: 30%;
  left: 25%;
  top: 9%;
  z-index: 1;
  transition: all .7s ease;
  -moz-transition: all .7s ease;
  -ms-transition: all .7s ease;
  -webkit-transition: all .7s ease;
  -o-transition: all .7s ease;
}

.Blizzard1:hover .BlizzPop {
  z-index: 1;
  -moz-transform: scale(1.5);
  -webkit-transform: scale(1.5);
  -o-transform: scale(1.5);
  -ms-transform: scale(1.5);
  transform: scale(1.5);
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand')";
  filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand');
}

<section class="FutureGoals">
  <div class="BlizzBox">
    <div class="Blizzard1">
      <img alt="BlizzPop" src="https://s8.postimg.cc/5avnnvurp/Blizz_Pop.png" class="BlizzPop">
    </div>
  </div>
</section>

https://jsfiddle.net/sb3rzm9t/8/

或设置 inset box-shadow 也使用 rgba() 颜色 （转换在 box-shadow 上也很有效）

box-shadow:inset 0 0 0 150vw rgba(0,0,0,0.5);/* hudge without blur to cover the whole container */

下面的演示

.FutureGoals {
  height: 100vh;
  overflow: hidden;
}

.BlizzBox {
  height: 100vh;
  overflow: hidden;
}

.Blizzard1 {
  background: url(https://s8.postimg.cc/g96x696k3/Blizzard.jpg);
  background-repeat: no-repeat;
  background-position: 75%;
  background-attachment: fixed;
  height: 100%;
  width: 100%;
  transition: all .5s ease;
  -moz-transition: all .5s ease;
  -ms-transition: all .5s ease;
  -webkit-transition: all .5s ease;
  -o-transition: all .5s ease;
  webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.Blizzard1:hover {
box-shadow:inset 0 0 0 150vw rgba(0,0,0,0.5);
  -moz-transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -o-transform: scale(1.1);
  -ms-transform: scale(1.1);
  transform: scale(1.1);
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand')";
  filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand');
}

.BlizzPop {
  position: relative;
  height: auto;
  width: 30%;
  left: 25%;
  top: 9%;
  z-index: 1;
  transition: all .7s ease;
  -moz-transition: all .7s ease;
  -ms-transition: all .7s ease;
  -webkit-transition: all .7s ease;
  -o-transition: all .7s ease;
}

.Blizzard1:hover .BlizzPop {
  z-index: 1;
  -moz-transform: scale(1.5);
  -webkit-transform: scale(1.5);
  -o-transform: scale(1.5);
  -ms-transform: scale(1.5);
  transform: scale(1.5);
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand')";
  filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.5, M12=0, M21=0, M22=1.5, SizingMethod='auto expand');
}

<section class="FutureGoals">
  <div class="BlizzBox">
    <div class="Blizzard1">
      <img alt="BlizzPop" src="https://s8.postimg.cc/5avnnvurp/Blizz_Pop.png" class="BlizzPop">
    </div>
  </div>
</section>

https://jsfiddle.net/sb3rzm9t/9/

如何在不影响前景项目的情况下调整 <div> 中背景图像的亮度？

How to adjust the brightness of a background image in a <div> without it affecting the foreground items?

html

css

background

hover

brightness