参数如下：
Image description
Artist
Copyright
Comment ACD Systems Digital Imaging
Make Canon
Model Canon PowerShot A40
Orientation upper left
X resolution 180
Y resolution 180
Datetime 2002:08:04 10:08:58
YCbCr positioning centered
Exposure time 1/640 s
F-number 4.8
Date/time original 2002:08:04 10:08:58
Date/time digitized 2002:08:04 10:08:58
Component config YCbCr
Shutter speed value 0.001573 s
Aperture value 4.52606
Exposure bias value 0
Max. aperture value 2.97086
Metering mode Pattern
Flash
Focal length 16.2 mm
User comment
Colorspace sRGB
Pixel X dimension 1600
Pixel Y dimension 1200
Focal plane X res. Unknown
Focal plane Y res. Unknown
Focal plane res. unit inch
Sensing method One-chip color area sensor
图片如下：
