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陈子舜，腾讯开放平台研发副总监。04年开始学前端，做重构，玩博客。06年入腾讯，做前端，玩空间。11年搞开放，做前端，玩手机。历经的产品不多，搞过PJBlog，QQ空间，接触过农牧场，腾讯开放平台。在7年前端生涯，发现前端技术水很深。从用户体验，性能优化，运营能力，编码效率，作为前端开发，压力越大机会越多，有木有。

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合色的图像真色彩图像（jpeg、png24、png32），色彩比较丰富包含16777216种颜色。调色板图像gif、png8，色彩简单只能包含256种颜色。但如果把真色彩图像，错误地使用了gif或png8格式会，通常会有损视觉效果。又如果把调色板图像，错误地使用了jpeg、png24、png32格式，通常会导致文件体积更大。小尺寸图片，即使色彩丰富也可以使用调色板图像，因为256种颜色一般足够对小图片进行视觉还原，而肉眼对小图的敏感度也没有那么高。 GIF 适当降低GIF失真度，可有效减少体积。利用Fireworks工具做压缩，Fireworks有一种叫“失真”可以压缩动画和静态的GIF图像，能提供0到100之间的压缩范围，选择压缩比例越大文件体积越小，当然着视觉体验也会随着降低。一种有损压缩的方法，在非必要的情况下，不建议使用这方法。隔行扫描用户体验好，但文件体积会变大。隔行扫描(某些软件又称：交错)指显示屏在显示一幅图像时，先扫描奇数行，全部完成奇数行扫描后再扫描偶数行，隔行扫描在还没有完成扫描时我们就已经能知道内容，能给我们带来更好的体检。虽然隔行扫描用户体验好，但文件体积会变大。所以在使用时我们要作出权衡了。 JPEG 除JPEG外，其它网络图像格式都是无损压缩，必要时为JPEG保留PSD源文件，以便修改维护。 JPEG品质一般选择在70 % ~80%之间，色彩越鲜艳要求品质越高。 JPEG不适合保存图形分明线条简单以及256颜色以下的图像。渐进式JPEG，用户体验更好，文件体积更小。适当的使用模糊降低JPEG细节，一些平滑过渡的颜色和色调，可减少图片体积。 JPEG2000图像更加细腻平滑，而且体积相比JPEG最高可减少30%，但JPEG2000还没有被广泛使用。 PNG PNG可分为，PNG8（调色板图像，支持半透明。但在PS只能导出布尔值的PNG8即要么不透明要么全透明不能实现全透明），PNG24（真色彩，不支持透明（和JPG唯一的区别是PNG24是无损的格式）、PNG32（真色彩，支持半透明。）半透明的PNG8，与PS里的透明PNG24，体积有很大差异，所以色彩简单256色内的半透明图片，尽量使用PNG8。在艺术加工过程中，可能把某些区域隐藏但依然占有数据空间，可利用PNGGauntlet工具对导出后的PNG，进行二次压缩把被隐藏数据清除。需要真色彩及透明度的效果我们需要用到PNG32但往往文件体积会比较大，在可行的情况下，我们可以使用SWF替换PNG32，但对性能会有一定的影响，建议大家可以参考权衡一下。工具 ImageMagick 、Gifsicle ：服务器及批量压缩的好工具。 PNGGauntlet：把GIF转换成PNG8，如果是GIF动画经转换后则成了静态的PNG8图片。对现有的PNG8、PNG24、PNG32进行二次压缩，把多余的数据块清除。 TweakPNG：是一款PNG数据块检查工具，经压缩过的PNG一般保留的数据块不超过5个。 Fireworks与Photoshop：相同的质量，Fireworks比Photoshop输出的图片体积更小。更多的工具参考： http://www.phpied.com/give-png-a-chance/

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