画像の情報を取得する (コマンド)
ImageMagickをインストールすると自動でついてくるidentifyコマンドを用いれば、画像の保存形式やサイズなどを簡単に取得することが出来る。
○シンプルに表示
identifyにファイル名を渡してやると画像形式、解像度などシンプルな情報を取得できる。
$ identify hoge.jpg
hoge.jpg JPEG 303x431 303x431+0+0 DirectClass 8-bit 145.752kb
hoge.jpg JPEG 303x431 303x431+0+0 DirectClass 8-bit 145.752kb
○詳細に表示
-verboseオプションをつけるとかなり詳細な情報が取得できる。
$ identify -verbose hoge.jpg
Image: hoge.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 303x431+0+0
Type: ColorSeparation
Endianess: Undefined
Colorspace: CMYK
Depth: 8-bit
Channel depth:
Cyan: 8-bit
Magenta: 8-bit
Yellow: 8-bit
Black: 8-bit
Channel statistics:
Cyan:
Min: 0 (0)
Max: 255 (1)
Mean: 111.969 (0.439093)
Standard deviation: 75.4756 (0.295983)
Magenta:
Min: 0 (0)
Max: 255 (1)
Mean: 116.246 (0.455867)
Standard deviation: 50.2108 (0.196905)
Yellow:
Min: 0 (0)
Max: 255 (1)
Mean: 143.773 (0.563817)
Standard deviation: 69.3664 (0.272025)
Black:
Min: 0 (0)
Max: 255 (1)
Mean: 67.2185 (0.263602)
Standard deviation: 85.1329 (0.333854)
Total ink density: 363%
Rendering intent: Undefined
Resolution: 350x350
Units: undefined
Filesize: 145.752kb
Interlace: None
Background color: white
Border color: cmyk(223,223,223,0)
Matte color: grey74
Transparent color: black
Page geometry: 303x431+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 99
Orientation: TopLeft
Exif:ColorSpace: 65535
Exif:Compression: 6
Exif:DateTime: 2007:03:26 21:05:58
Exif:ExifImageLength: 431
Exif:ExifImageWidth: 303
Exif:ExifOffset: 164
Exif:JPEGInterchangeFormat: 302
Exif:JPEGInterchangeFormatLength: 7335
Exif:Orientation: 1
Exif:ResolutionUnit: 2
Exif:Software: Adobe Photoshop CS2 Windows
Exif:XResolution: 3500000/10000
Exif:YResolution: 3500000/10000
Jpeg:colorspace: 4
Jpeg:sampling-factor: 1x1,1x1,1x1,1x1
Rdf:about:
Signature: 73f86ebc098f1c4708e4cda5bd95bc55fceb919b25fb6394744433518fc99101
Xmlns:exif: http://ns.adobe.com/exif/1.0/
Profile-8bim: 9062 bytes
Profile-exif: 7643 bytes
Profile-xmp: 14996 bytes
Tainted: False
Version: ImageMagick 6.3.6 10/19/07 Q16 http://www.imagemagick.org
Image: hoge.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 303x431+0+0
Type: ColorSeparation
Endianess: Undefined
Colorspace: CMYK
Depth: 8-bit
Channel depth:
Cyan: 8-bit
Magenta: 8-bit
Yellow: 8-bit
Black: 8-bit
Channel statistics:
Cyan:
Min: 0 (0)
Max: 255 (1)
Mean: 111.969 (0.439093)
Standard deviation: 75.4756 (0.295983)
Magenta:
Min: 0 (0)
Max: 255 (1)
Mean: 116.246 (0.455867)
Standard deviation: 50.2108 (0.196905)
Yellow:
Min: 0 (0)
Max: 255 (1)
Mean: 143.773 (0.563817)
Standard deviation: 69.3664 (0.272025)
Black:
Min: 0 (0)
Max: 255 (1)
Mean: 67.2185 (0.263602)
Standard deviation: 85.1329 (0.333854)
Total ink density: 363%
Rendering intent: Undefined
Resolution: 350x350
Units: undefined
Filesize: 145.752kb
Interlace: None
Background color: white
Border color: cmyk(223,223,223,0)
Matte color: grey74
Transparent color: black
Page geometry: 303x431+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 99
Orientation: TopLeft
Exif:ColorSpace: 65535
Exif:Compression: 6
Exif:DateTime: 2007:03:26 21:05:58
Exif:ExifImageLength: 431
Exif:ExifImageWidth: 303
Exif:ExifOffset: 164
Exif:JPEGInterchangeFormat: 302
Exif:JPEGInterchangeFormatLength: 7335
Exif:Orientation: 1
Exif:ResolutionUnit: 2
Exif:Software: Adobe Photoshop CS2 Windows
Exif:XResolution: 3500000/10000
Exif:YResolution: 3500000/10000
Jpeg:colorspace: 4
Jpeg:sampling-factor: 1x1,1x1,1x1,1x1
Rdf:about:
Signature: 73f86ebc098f1c4708e4cda5bd95bc55fceb919b25fb6394744433518fc99101
Xmlns:exif: http://ns.adobe.com/exif/1.0/
Profile-8bim: 9062 bytes
Profile-exif: 7643 bytes
Profile-xmp: 14996 bytes
Tainted: False
Version: ImageMagick 6.3.6 10/19/07 Q16 http://www.imagemagick.org
ちなみに、複数ファイルの指定もできます。
$ identify hoge.jpg huga.jpg
hoge.jpg JPEG 303x431 303x431+0+0 DirectClass 8-bit 145.752kb
huga.jpg[1] JPEG 210x298 210x298+0+0 DirectClass 8-bit 16.1895kb
hoge.jpg JPEG 303x431 303x431+0+0 DirectClass 8-bit 145.752kb
huga.jpg[1] JPEG 210x298 210x298+0+0 DirectClass 8-bit 16.1895kb
