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