今天在群里讨论网页中关于图片的优化,听到一个高大上的名词渐进式jpg(Progressive JPEG),查了一下又发现了标准型(Baseline JPEG)显示方式、还有png图片的交错式PNG,这才恍然大悟,原来这就是最最常见的两种图片显示方式,相信你也和我一样见到过,但说不上名字。
1.渐进式Progressive JPEG
1.1显示方式
这种显示方式目前来说是最常见的,比如qq空间、百度图片等等,其效果是:打开图片后,由于网速原因,只会显示一张比较模糊地图片样式,随着不断的加载,图片会越来越清晰,很牛逼是不是?但代价是需要消耗更多的cpu,但对现在计算机性能来说这算不了什么。
1.2如何把图片设为渐进式?
用我们强大的ps,在另存为或存储为web所用格式时勾选连续即可:
图片另存为: 存储为web所用格式:
当然,伟大的程序员们也可以用各种编程语言来处理比如c#,python,这些都能对图片进行加工,这里就不做介绍。
1.3 交错式PNG
以上是针对jpg格式的图片,对于png图片来说我们只要在另存为时勾选交错即可:
2.标准型(Baseline JPEG)
要标准型方式显示的图片目前已经不太多见了,在我的记忆力好久没见过一张大图一点点的从上到下加载进来的了,但这种显示方式估计大家一样并不陌生:
ps默认保存的类型就是标准型:
作为前端开发人员,在切图时还是建议保存为渐进式,没什么,只为更好的用户体验。

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