首頁文件分類網站建置CentOS使用 ImageMagick Identify 識別功能
使用 ImageMagick Identify 識別功能

識別程序描述一個或多個圖像文件的格式和特徵,還會報告圖像是不完整還是損壞。

返回的信息包括圖像編號,文件名稱,圖像的寬度和高度,圖像是否為彩色圖,圖像中的顏色數,圖像中的字節數,圖像的格式(JPEG,PNG等),最後是讀取和處理圖像所花費的秒數。

而 verbose 選項提供了更多屬性。

有關如何構建識別命令的建議,請參閱命令行處理,或參見下面的命令用法示例。

/usr/local/ImageMagick/bin/magick identify -help

範例用法

我們在此列出了一些識別命令的範例,以說明其有用性和易用性。


首先,識別 JPEG 格式的圖像:

/usr/local/ImageMagick/bin/magick identify rose.jpg
rose.jpg JPEG 70x46 70x46+0+0 8-bit sRGB 4069B 0.000u 0:00.000

再來,更詳細地查看相同的圖像:

/usr/local/ImageMagick/bin/magick identify -verbose rose.jpg
Image: rose.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 70x46+0+0
  Resolution: 72x72
  Print size: 0.972222x0.638889
  Units: PixelsPerInch
  Colorspace: sRGB
  Type: TrueColor
  Base type: Undefined
  Endianess: Undefined
  Depth: 8-bit
  Channel depth:
    Red: 8-bit
    Green: 8-bit
    Blue: 8-bit
  Channel statistics:
    Pixels: 3220
    Red:
      min: 37  (0.145098)
      max: 255 (1)
      mean: 145.579 (0.570899)
      standard deviation: 67.3299 (0.264039)
      kurtosis: -1.3792
      skewness: 0.0975578
      entropy: 0.972583
    Green:
      min: 31  (0.121569)
      max: 255 (1)
      mean: 89.2466 (0.349987)
      standard deviation: 52.0593 (0.204154)
      kurtosis: 2.71248
      skewness: 1.83046
      entropy: 0.875544
    Blue:
      min: 17  (0.0666667)
      max: 255 (1)
      mean: 80.4068 (0.315321)
      standard deviation: 54.0105 (0.211806)
      kurtosis: 3.00057
      skewness: 1.95559
      entropy: 0.852568
  Image statistics:
    Overall:
      min: 17  (0.0666667)
      max: 255 (1)
      mean: 105.078 (0.412069)
      standard deviation: 57.7999 (0.226666)
      kurtosis: -0.250668
      skewness: 1.03343
      entropy: 0.900232
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33)
    green primary: (0.3,0.6)
    blue primary: (0.15,0.06)
    white point: (0.3127,0.329)
  Matte color: grey74
  Background color: white
  Border color: srgb(223,223,223)
  Transparent color: none
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 70x46+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 100
  Orientation: Undefined
  Properties:
    date:create: 2018-11-01T15:09:07+08:00
    date:modify: 2018-11-01T15:09:07+08:00
    jpeg:colorspace: 2
    jpeg:sampling-factor: 2x2,1x1,1x1
    signature: ac47438728e9f0fd8773883e18f8aa569dbe624488b67cf668827f27f81be590
  Artifacts:
    verbose: true
  Tainted: False
  Filesize: 4069B
  Number pixels: 3220
  User time: 0.000u
  Elapsed time: 0:01.000
  Version: ImageMagick 7.0.8-12 Q16 x86_64 2018-10-08 https://imagemagick.org

要獲得 72 DPI 圖像的英寸打印尺寸,使用:

/usr/local/ImageMagick/bin/magick identify -format '%[fx:w/72] by %[fx:h/72] inches' document.png
8.5 x 11 inches

必須在命令行中指定原始圖像的深度和尺寸:

/usr/local/ImageMagick/bin/magick identify -depth 8 -size 640x480 image.raw
image.raw RGB 640x480 sRGB 9kb 0.000u 0:01

顯示圖像紋理特徵,時刻,感知哈希以及圖像中唯一顏色的數量:

/usr/local/ImageMagick/bin/magick identify -verbose -features 1 -moments -unique image.png

這是一個特殊的定義,輸出圖像的最小或最大像素的位置:

/usr/local/ImageMagick/bin/magick identify -precision 5 -define identify:locate=maximum -define identify:limit=3 image.png

可以在 Examples of ImageMagick Usage 中找到使用標識的其他示例。


選項摘要

-alphaon, activate, off, deactivate, set, opaque, copy, transparent, extract, background, or shape the alpha channel
-antialiasremove pixel-aliasing
-authenticate valuedecrypt image with this password
-channel typeapply option to select image channels
-clipclip along the first path from the 8BIM profile
-clip-mask filenameassociate clip mask with the image
-clip-path idclip along a named path from the 8BIM profile
-colorspace typeset image colorspace
-crop geometrycrop the image
-debug eventsdisplay copious debugging information
-define format:optiondefine one or more image format options
-density geometryhorizontal and vertical density of the image
-depth valueimage depth
-endian typeendianness (MSB or LSB) of the image
-extract geometryextract area from image
-features distanceanalyze image features (e.g. contract, correlations, etc.).
-format stringoutput formatted image characteristics
-gamma valuelevel of gamma correction
-grayscale methodconvert image to grayscale
-helpprint program options
-interlace typetype of image interlacing scheme
-interpolate methodpixel color interpolation method
-limit type valuepixel cache resource limit
-list typeColor, Configure, Delegate, Format, Magic, Module, Resource, or Type
-log formatformat of debugging information
-mask filenameassociate a mask with the image
-momentsdisplay image moments and perceptual hash.
-monitormonitor progress
-negatereplace each pixel with its complementary color
-precision valueset the maximum number of significant digits to be printed
-quietsuppress all warning messages
-regard-warningspay attention to warning messages.
-respect-parenthesessettings remain in effect until parenthesis boundary.
-sampling-factor geometryhorizontal and vertical sampling factor
-set attribute valueset an image attribute
-size geometrywidth and height of image
-stripstrip image of all profiles and comments
-uniquedisplay image the number of unique colors in the image.
-units typethe units of image resolution
-verboseprint detailed information about the image
-versionprint version information
-virtual-pixel methodaccess method for pixels outside the boundaries of the image

參考資料:

Command-line Tools: Identify @ ImageMagick

https://www.imagemagick.org/script/identify.php

首頁文件分類網站建置CentOS使用 ImageMagick Identify 識別功能