获取图像的压缩比 [英] Get compression ratio of image

问题描述

我使用LibJPEG来读取JPEG压缩的图片。有没有办法获得不变的图像的当前压缩率？

I use LibJPEG to read JPEG compressed images. Is there a way to get the current compression ratio of the unchanged image?

推荐答案

0-100？

这不是存储的 - 它被用作图像编码的指南，关于波浪的准确度，然后丢弃。在任何JFIF头结构中没有任何字段。据我所知，这个数字对编码器意味着什么没有正式的定义，所以你不能精确地确定任何给定数字的效果。

That isn't stored - it's used as a guide for the image encode as to how accurate the waves should be, and it's then discarded. There's no field for it in any of the JFIF header structures. As far as I can see there's no formal definition of what this number means across encoders and so you can't precisely determine the effects of any given number anyway.

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