所有的JPEG文件都是JFIF吗? [英] Are all JPEG files JFIF?

问题描述

Active Directory可以根据 jpegPhoto属性定义.我想使用它，但我从未听说过JFIF.

Active Directory can store images in JPEG File Interchange Format (JFIF) according to the jpegPhoto Attribute definition. I'd like to use this but I'd never heard of JFIF.

首先，是否所有JPEG文件都是JFIF?

First, are all JPEG files JFIFs?

第二，WPF JpegBitmapEncoder是否生成JFIF文件?我想如果第一个是正确的，那就是，但是如果不是...?

Second, does a WPF JpegBitmapEncoder produce a JFIF file? I guess if the first is true, this will be but if it's not...?

推荐答案

JPEG =压缩算法(联合图像专家组)

JPEG = the compression algorithm (Joint Photographic Experts Group)

JFIF =文件格式(JPEG文件交换格式)

JFIF = the file format (JPEG File Interchange Format)

有效地，当您提到jpeg/jpg时，您实际上是在谈论JPEG/JFIF，尽管有JPEG/TIFF和JPEG/EXIF规范(通常在数码照片中会看到它们)

Effectively when you mention jpeg/jpg you are actually talking about JPEG/JFIF, although there is a spec for JPEG/TIFF and JPEG/EXIF (usually digital photos is where you'll see these)

很多时候产生EXIF文件的内容也会包含JFIF解析器需要正确解码的内容，因此它对最终用户是透明的，但并不完全是有效"和符合规范"的EXIF文件.

A lot of the time whatever produces the EXIF file will also include what JFIF parsers need to decode properly, so it is transparent to the end user, but not entirely a "valid" and "to spec" EXIF file.

对于Internet使用和传输，默认值为JFIF，但当您在幕后看时，并非所有jpeg都一定是JFIF.

For internet use and transmission the default is JFIF, but not all jpegs are necessarily JFIF when you look under the covers.

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