html - CSS - Background-size : cover; is too big. 如何调整大小？

Question

我正在尝试一个简单的 CSS 视差效果，方法是将背景图像固定为封面的背景大小。一切似乎都如我所愿，但背景图像太大了。与原始文件相比，它也被裁剪和放大。如果我尝试删除“cover”属性，并用更具体的尺寸替换它，“parallex”类型的影响就会消失，我会留下一个奇怪的图像滚动过渡。

调整背景图像大小的最佳方式是什么，这样我就可以按照自己喜欢的方式裁剪它，同时还能产生我想要的效果？到目前为止，图像放大得太大了。

    .fullwidth_100 {
width:100%;
height:500px;
background-image:url('http://www.myorderdesk.com/Providers/206190/Files/31/full_width_image_1.jpg');
background-position: center center;
background-attachment:fixed;
background-repeat: no-repeat;
/*background-size: 100% 80%; */
background-size:cover;
-webkit-transition: background-image 0.4s;
-moz-transition: background-image 0.4s;
-ms-transition: background-image 0.4s;
-o-transition: background-image 0.4s;
transition: background-image 0.4s;
overflow: hidden;
-webkit-font-smoothing: subpixel-antialiased;
}

这是我的 Demo

Answer 1

第 1 步:下载图片第二步:找到图像的宽度和高度第 3 步:像这样设置高度和宽度:

.fullwidth_100 {
    width: 1080px;
    height: 500px;
}`

.fullwidth_100 {
width: 1440px;
height: 500px;
background-image:url('http://www.myorderdesk.com/Providers/206190/Files/31/full_width_image_1.jpg');
background-position: center center;
-webkit-transition: background-image 0.4s;
-moz-transition: background-image 0.4s;
-ms-transition: background-image 0.4s;
-o-transition: background-image 0.4s;
transition: background-image 0.4s;
overflow: hidden;
-webkit-font-smoothing: subpixel-antialiased;
}

<div class="fullwidth_100">
         	<div class="large-12 columns">
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