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如何为网页选择合适的图像格式?

图像格式很多,在Web上最常用的其实只有三种:JPEG、PNG和GIF。

如何使用这三种格式的图像呢?

图片和复杂图像使用JPEG

JPEG最适合连续色调的图像如照片,可以表示包含多达1600万种不同颜色的图像。

这是一种有损的格式,缩小文件大小的时候会丢掉图像的一些信息。

格式不支持透明度和动画,但是质量相当时文件比较小,可以高效显示Web页面。

单色图像、logo和几何图形使用PNG或GIF

两种格式最适合单色图像和线条构成的图像,如logo、剪贴画和图像中的小文本。

两种格式都是无损格式,通过压缩文件来缩小文件大小,不会丢掉信息。

两种格式都允许将颜色设置为“透明”,使图像下面的东西可以显示出来。

一般比相应的JPEG格式文件大。

不同之处:

PNG可以表示包含上百万种不同颜色的图像。

根据可以表示多少颜色分三种:PNG-8、PNG-24和PNG-32。

取决于使用的颜色数,可能比GIF大也可能小,不能使用动画。

GIF文件只能表示最多256种不同颜色的图像,支持动画。

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