怎么检测远程图片是否是渐进式呢 - V2EX
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怎么检测远程图片是否是渐进式呢

  •   
  •   bestmos May 6, 2022 1996 views
    This topic created in 1471 days ago, the information mentioned may be changed or developed.
    我想实现如果图片加载方式是渐进式就不处理，如果是线性加载（官方点叫做逐行扫描？）的图就改为隔行扫描。

    PHP 项目，目前只找到 PHP 的函数 imageinterlace($image,1);也只能处理不能检测，而每张图处理的话，大量图片处理下来太费时间了。

    有哪个语言能处理这个吗，或者是否存在对比十六进制编码这些方法进行判断。
  • PHP
  • 渐进式
  • 处理
  • 图片
    2 replies    2022-05-06 18:14:20 +08:00
    sanmaozhao
        1
    sanmaozhao  
       May 6, 2022
    这个需求我觉得应该在 nginx 层去处理，而不是自己写 php 代码

    http://nginx.org/en/docs/http/ngx_http_image_filter_module.html

    image_filter_interlace on

    If enabled, final images will be interlaced. For JPEG, final images will be in “progressive JPEG” format.
    bestmos
        2
    bestmos  
    OP
       May 6, 2022
    @sanmaozhao 图像是来自于不同的图床，我这边做的只是获取用户给的链接。然后只处理有需要的
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