View Image File Metadata From the Command Line
Did you know you can access all the information store in a JPG/PNG/GIF file from the command line? Install the ImageMagick package and do this:
identify -verbose image_file.jpg
The output will be something llike this:
Image: image_file.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 640×480+0+0
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: 115.959 (0.45474)
Standard deviation: 76.5409 (0.30016)
Green:
Min: 0 (0)
Max: 255 (1)
Mean: 114.635 (0.449548)
Standard deviation: 81.5852 (0.319942)
Blue:
Min: 0 (0)
Max: 255 (1)
Mean: 116.819 (0.458114)
Standard deviation: 84.7587 (0.332387)
Rendering intent: Undefined
Units: PixelsPerInch
Filesize: 62.5703kb
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 640×480+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 90
Orientation: Undefined
Jpeg:colorspace: 2
Jpeg:sampling-factor: 2×1,1×1,1×1
Signature: 59dddedfad604ea3f369256c41ed3f42bf6150cf960d62409cfc8c6103b65e18
Tainted: False
Version: ImageMagick 6.3.7 08/21/08 Q16 http://www.imagemagick.org
You can use this to extract specific fields from image files and make scripts that sort your images according to quality, background color or image size.
Original tip here.
Good tip!!!!
I was needing the info ^_^
You can also use jhead, and file to extract some more simple information although some of it may be repeated.