Jhead 是一个用C语言开发的用来操作图像文件的EXIF信息的库。读取 EXIF 信息时输出如下：
Sample jhead output:
File name : 0805-153933.jpg File size : 463023 bytes File date : 2001:08:12 21:02:04 Camera make : Canon Camera model : Canon PowerShot S100 Date/Time : 2001:08:05 15:39:33 Resolution : 1600 x 1200 Flash used : No Focal length : 5.4mm (35mm equivalent: 36mm) CCD Width : 5.23mm Exposure time: 0.100 s (1/10) Aperture : f/2.8 Focus Dist. : 1.18m Metering Mode: center weight Jpeg process : Baseline
