Comment puis-je déterminer la taille d'une image à partir de la ligne de commande?

J'ai une image appelée ZEAKR.jpg. Comment connaître sa taille et son format depuis la ligne de commande?

Utilisez la commande identify, qui fait partie d'ImageMagick.

Exemples:

$ identify ZEAKR.jpg 
ZEAKR.jpg JPEG 400x600 400x600+0+0 8-bit DirectClass 49.9KB 0.000u 0:00.000

ou

$ identify -verbose ZEAKR.jpg 
Image: ZEAKR.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Class: DirectClass
  Geometry: 400x600+0+0
  Resolution: 72x72
  Print size: 5.55556x8.33333
  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: 37.8679 (0.148501)
      standard deviation: 83.5317 (0.327575)
      kurtosis: 1.46576
      skewness: 1.83875
    Green:
      min: 0 (0)
      max: 255 (1)
      mean: 60.6554 (0.237864)
      standard deviation: 54.9167 (0.21536)
      kurtosis: 1.74308
      skewness: 1.84745
    Blue:
      min: 0 (0)
      max: 255 (1)
      mean: 67.6817 (0.265418)
      standard deviation: 28.1072 (0.110224)
      kurtosis: 0.599932
      skewness: -0.97633
  Image statistics:
    Overall:
      min: 0 (0)
      max: 255 (1)
      mean: 55.4017 (0.217261)
      standard deviation: 59.9539 (0.235113)
      kurtosis: 2.34592
      skewness: 1.64301
  Rendering intent: Undefined
  Interlace: None
  Background color: white
  Border color: rgb(223,223,223)
  Matte color: grey74
  Transparent color: black
  Compose: Over
  Page geometry: 400x600+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 96
  Orientation: Undefined
  Properties:
    date:create: 2012-06-23T11:22:15-05:00
    date:modify: 2012-06-23T11:22:15-05:00
    jpeg:colorspace: 2
    jpeg:sampling-factor: 1x1,1x1,1x1
    signature: 2beab0779fc657fb62e8609b600d90d1e502f614794e497299ffaa28d145408e
  Artifacts:
    verbose: true
  Tainted: False
  Filesize: 49.9KBB
  Number pixels: 240KB
  Pixels per second: 24MB
  User time: 0.000u
  Elapsed time: 0:01.009
  Version: ImageMagick 6.6.9-7 2012-04-30 Q16 http://www.imagemagick.org