ImageMagick's identify :
$ identify -verbose $file
Image: We Live No More by vhm_alex.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 1920x1200+0+0
Resolution: 100x100
Print size: 19.2x12
Units: Undefined
Type: TrueColor
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Red:
min: 0 (0)
max: 255 (1)
mean: 119.898 (0.470189)
standard deviation: 119.244 (0.467623)
kurtosis: -1.90522
skewness: 0.149589
Green:
min: 0 (0)
max: 255 (1)
mean: 121.541 (0.476631)
standard deviation: 118.848 (0.46607)
kurtosis: -1.9068
skewness: 0.135223
Blue:
min: 0 (0)
max: 255 (1)
mean: 123.619 (0.484782)
standard deviation: 118.213 (0.463581)
kurtosis: -1.90561
skewness: 0.117145
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 121.686 (0.477201)
standard deviation: 118.769 (0.465761)
kurtosis: -1.90559
skewness: 0.133856
Rendering intent: Undefined
Interlace: JPEG
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Compose: Over
Page geometry: 1920x1200+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 93
Orientation: Undefined
Properties:
date:create: 2011-07-06T20:16:05+03:00
date:modify: 2010-05-11T16:11:32+03:00
jpeg:colorspace: 2
jpeg:sampling-factor: 1x1,1x1,1x1
signature: b35ad216a554f94d6ce0319b08bf18e1047b09fe835bace9e92fa5940f1bc3fe
Profiles:
Profile-APP12: 15 bytes
Artifacts:
verbose: true
Tainted: False
Filesize: 759KBB
Number pixels: 2.304MB
Pixels per second: 25.6MB
User time: 0.080u
Elapsed time: 0:01.089
Version: ImageMagick 6.7.1-0 2011-07-10 Q16 http://www.imagemagick.org