The KenBurnsFader class handles the fade-in and fade-out of the image using opacity.
kenburnsfader类使用不透明度处理图像的淡入淡出。
It also has a reference to the HTML tag that displays the image in the document as well as handy helper methods to move the image, set its opacity, and so on.
该对象还包含对在文档中显示图像的HTML标记的引用，以及移动图像、设置透明度等的helper方法。
Next, we will reduce the opacity of the "sky" layer since it is making the whole image look unreal.
下一步，我们将减少“天空”层不透明度，因为它是使整个图像看起来不真实。
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