用更少的管道显示图像元数据？

菲利普·柯比布莱德

我正在观看有关减少管道数量的视频，并且制造商能够打开图像文件并获取一堆元数据：

我的系统似乎管道较少，我可以使用来查看PDF和压缩文件less，但是打开图像时我没有得到任何元数据。我只得到如下一行。

我在视频中注意到它ffmpeg在底部说，并且确实安装了它。是否可以更改某种设置less以显示图像的更多详细信息？

用于检查较少管道的命令已安装：

echo $LESSOPEN

用于打开图像的命令：

less image.jpg

保罗·托梅（PauloTomé）

如源代码存储库的自述文件中所述lesspipe，它需要identifyjpg，png和gif文件的实用程序（来自ImageMagick）。

jpg, png, gif requires identify

验证identify工具，我注意到，从ouptup其使用视频的作者是调用与该-verbose标志，而你获得的输出（和我在我的Debian系统巴斯特）是没有的标志：

$ identify jpeg-file.jpg
jpeg-file.jpg JPEG 415x415 415x415+0+0 8-bit sRGB 26138B 0.010u 0:00.000

$ identify -verbose jpeg-file.jpg
Image: jpeg-file.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 415x415+0+0
  Resolution: 96x96
  Print size: 4.32292x4.32292
  Units: PixelsPerInch
  Colorspace: sRGB
  Type: Grayscale
  Base type: Undefined
  Endianess: Undefined
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
  Channel statistics:
    Pixels: 172225
    Red:
      min: 0  (0)
      max: 255 (1)
      mean: 153.031 (0.600122)
      standard deviation: 122.135 (0.478962)
      kurtosis: -1.80175
      skewness: -0.416927
      entropy: 0.323346
    Green:
      min: 0  (0)
      max: 255 (1)
      mean: 153.031 (0.600122)
      standard deviation: 122.135 (0.478962)
      kurtosis: -1.80175
      skewness: -0.416927
      entropy: 0.323346
    Blue:
      min: 0  (0)
      max: 255 (1)
      mean: 153.031 (0.600122)
      standard deviation: 122.135 (0.478962)
      kurtosis: -1.80175
      skewness: -0.416927
      entropy: 0.323346
  Image statistics:
    Overall:
      min: 0  (0)
      max: 255 (1)
      mean: 153.031 (0.600122)
      standard deviation: 122.135 (0.478962)
      kurtosis: -1.80174
      skewness: -0.41693
      entropy: 0.323346
  Colors: 256
  Histogram:
     54858: (  0,  0,  0) #000000 black
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        11: ( 88, 88, 88) #585858 srgb(88,88,88)
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         7: ( 90, 90, 90) #5A5A5A srgb(90,90,90)
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        20: ( 94, 94, 94) #5E5E5E grey37
         7: ( 95, 95, 95) #5F5F5F srgb(95,95,95)
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        13: ( 97, 97, 97) #616161 grey38
        81: ( 98, 98, 98) #626262 srgb(98,98,98)
        10: ( 99, 99, 99) #636363 grey39
         9: (100,100,100) #646464 srgb(100,100,100)
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         3: (103,103,103) #676767 srgb(103,103,103)
        51: (104,104,104) #686868 srgb(104,104,104)
         7: (105,105,105) #696969 DimGray
        10: (106,106,106) #6A6A6A srgb(106,106,106)
        10: (107,107,107) #6B6B6B grey42
         5: (108,108,108) #6C6C6C srgb(108,108,108)
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         7: (110,110,110) #6E6E6E grey43
         7: (111,111,111) #6F6F6F srgb(111,111,111)
        16: (112,112,112) #707070 grey44
        51: (113,113,113) #717171 srgb(113,113,113)
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         4: (115,115,115) #737373 grey45
        10: (116,116,116) #747474 srgb(116,116,116)
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         9: (121,121,121) #797979 srgb(121,121,121)
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         8: (126,126,126) #7E7E7E gray
       176: (127,127,127) #7F7F7F grey50
        12: (128,128,128) #808080 fractal
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        12: (151,151,151) #979797 srgb(151,151,151)
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       150: (157,157,157) #9D9D9D srgb(157,157,157)
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         4: (159,159,159) #9F9F9F srgb(159,159,159)
         7: (160,160,160) #A0A0A0 srgb(160,160,160)
         7: (161,161,161) #A1A1A1 grey63
         4: (162,162,162) #A2A2A2 srgb(162,162,162)
        12: (163,163,163) #A3A3A3 grey64
        10: (164,164,164) #A4A4A4 srgb(164,164,164)
         9: (165,165,165) #A5A5A5 srgb(165,165,165)
         7: (166,166,166) #A6A6A6 grey65
        11: (167,167,167) #A7A7A7 srgb(167,167,167)
        25: (168,168,168) #A8A8A8 grey66
        14: (169,169,169) #A9A9A9 DarkGray
        17: (170,170,170) #AAAAAA srgb(170,170,170)
        10: (171,171,171) #ABABAB grey67
        44: (172,172,172) #ACACAC srgb(172,172,172)
        12: (173,173,173) #ADADAD grey68
         8: (174,174,174) #AEAEAE srgb(174,174,174)
         9: (175,175,175) #AFAFAF srgb(175,175,175)
         9: (176,176,176) #B0B0B0 grey69
         8: (177,177,177) #B1B1B1 srgb(177,177,177)
         9: (178,178,178) #B2B2B2 srgb(178,178,178)
        14: (179,179,179) #B3B3B3 grey70
        15: (180,180,180) #B4B4B4 srgb(180,180,180)
        15: (181,181,181) #B5B5B5 grey71
         9: (182,182,182) #B6B6B6 srgb(182,182,182)
        10: (183,183,183) #B7B7B7 srgb(183,183,183)
        14: (184,184,184) #B8B8B8 grey72
        11: (185,185,185) #B9B9B9 srgb(185,185,185)
        19: (186,186,186) #BABABA grey73
        56: (187,187,187) #BBBBBB srgb(187,187,187)
       366: (188,188,188) #BCBCBC srgb(188,188,188)
       155: (189,189,189) #BDBDBD grey74
        18: (190,190,190) #BEBEBE grey
        29: (191,191,191) #BFBFBF grey75
       123: (192,192,192) #C0C0C0 silver
        18: (193,193,193) #C1C1C1 srgb(193,193,193)
       148: (194,194,194) #C2C2C2 grey76
        19: (195,195,195) #C3C3C3 srgb(195,195,195)
        10: (196,196,196) #C4C4C4 grey77
         7: (197,197,197) #C5C5C5 srgb(197,197,197)
        16: (198,198,198) #C6C6C6 srgb(198,198,198)
        11: (199,199,199) #C7C7C7 grey78
        17: (200,200,200) #C8C8C8 srgb(200,200,200)
        14: (201,201,201) #C9C9C9 grey79
        35: (202,202,202) #CACACA srgb(202,202,202)
         9: (203,203,203) #CBCBCB srgb(203,203,203)
        12: (204,204,204) #CCCCCC grey80
       153: (205,205,205) #CDCDCD srgb(205,205,205)
        10: (206,206,206) #CECECE srgb(206,206,206)
       107: (207,207,207) #CFCFCF grey81
         9: (208,208,208) #D0D0D0 srgb(208,208,208)
        16: (209,209,209) #D1D1D1 grey82
        17: (210,210,210) #D2D2D2 srgb(210,210,210)
        22: (211,211,211) #D3D3D3 LightGray
        17: (212,212,212) #D4D4D4 grey83
       334: (213,213,213) #D5D5D5 srgb(213,213,213)
        12: (214,214,214) #D6D6D6 grey84
        11: (215,215,215) #D7D7D7 srgb(215,215,215)
        13: (216,216,216) #D8D8D8 srgb(216,216,216)
        63: (217,217,217) #D9D9D9 grey85
        23: (218,218,218) #DADADA srgb(218,218,218)
        17: (219,219,219) #DBDBDB grey86
        19: (220,220,220) #DCDCDC gainsboro
        13: (221,221,221) #DDDDDD srgb(221,221,221)
        14: (222,222,222) #DEDEDE grey87
        30: (223,223,223) #DFDFDF srgb(223,223,223)
       120: (224,224,224) #E0E0E0 grey88
        23: (225,225,225) #E1E1E1 srgb(225,225,225)
        20: (226,226,226) #E2E2E2 srgb(226,226,226)
        16: (227,227,227) #E3E3E3 grey89
        23: (228,228,228) #E4E4E4 srgb(228,228,228)
        18: (229,229,229) #E5E5E5 grey90
        17: (230,230,230) #E6E6E6 srgb(230,230,230)
        16: (231,231,231) #E7E7E7 srgb(231,231,231)
       130: (232,232,232) #E8E8E8 grey91
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        28: (234,234,234) #EAEAEA srgb(234,234,234)
        33: (235,235,235) #EBEBEB grey92
       230: (236,236,236) #ECECEC srgb(236,236,236)
       252: (237,237,237) #EDEDED grey93
        37: (238,238,238) #EEEEEE srgb(238,238,238)
        53: (239,239,239) #EFEFEF srgb(239,239,239)
        35: (240,240,240) #F0F0F0 grey94
        58: (241,241,241) #F1F1F1 srgb(241,241,241)
        48: (242,242,242) #F2F2F2 grey95
        80: (243,243,243) #F3F3F3 srgb(243,243,243)
       101: (244,244,244) #F4F4F4 srgb(244,244,244)
       124: (245,245,245) #F5F5F5 grey96
       226: (246,246,246) #F6F6F6 srgb(246,246,246)
       170: (247,247,247) #F7F7F7 grey97
       380: (248,248,248) #F8F8F8 srgb(248,248,248)
       307: (249,249,249) #F9F9F9 srgb(249,249,249)
       406: (250,250,250) #FAFAFA grey98
      1012: (251,251,251) #FBFBFB srgb(251,251,251)
      1658: (252,252,252) #FCFCFC grey99
      4279: (253,253,253) #FDFDFD srgb(253,253,253)
     76560: (254,254,254) #FEFEFE srgb(254,254,254)
     14197: (255,255,255) #FFFFFF white
  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)
  Background color: white
  Border color: srgb(223,223,223)
  Matte color: grey74
  Transparent color: black
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 415x415+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 79
  Orientation: Undefined
  Properties:
    date:create: 2019-12-21T23:19:03+00:00
    date:modify: 2019-12-21T23:18:51+00:00
    exif:Artist: Avinash singh
    exif:DateTimeDigitized: 2019:09:30 15:17:42
    exif:DateTimeOriginal: 2019:09:30 15:17:42
    exif:ExifOffset: 2136
    exif:SubSecTimeDigitized: 32
    exif:SubSecTimeOriginal: 32
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  Profiles:
    Profile-exif: 4338 bytes
    Profile-xmp: 2817 bytes
  Artifacts:
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    verbose: true
  Tainted: False
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  User time: 0.010u
  Elapsed time: 0:01.000
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检查脚本代码（在我的系统中为/bin/lesspipe），在第133行中，该identify实用程序在没有详细标志的情况下被调用。

总而言之，最有可能的是，系统中的lesspipe脚本来自不带冗长标志的情况下调用identify的版本。

带有标志的源代码存储库命令中的lesspipe.sh文件的版本正在被调用。lesspipeidentify

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