identify -verbose 22.png 
Image: 22.png
  Format: PNG (Portable Network Graphics)
  Class: PseudoClass
  Geometry: 1600x1200+0+0
  Resolution: 27.95x27.95
  Print size: 57.2451x42.9338
  Units: PixelsPerCentimeter
  Type: Grayscale
  Base type: Grayscale
  Endianess: Undefined
  Colorspace: Gray
  Depth: 8-bit
  Channel depth:
    gray: 8-bit
  Channel statistics:
    Gray:
      min: 0 (0)
      max: 255 (1)
      mean: 36.2126 (0.14201)
      standard deviation: 84.2917 (0.330556)
      kurtosis: 2.36406
      skewness: 2.04865
  Colors: 256
  Histogram:
   1510099: (  0,  0,  0) #000000 gray(0,0,0)
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      3625: (  2,  2,  2) #020202 gray(2,2,2)
      2529: (  3,  3,  3) #030303 gray(3,3,3)
      2574: (  4,  4,  4) #040404 gray(4,4,4)
      3191: (  5,  5,  5) #050505 gray(5,5,5)
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       859: ( 24, 24, 24) #181818 gray(24,24,24)
       848: ( 25, 25, 25) #191919 gray(25,25,25)
       942: ( 26, 26, 26) #1A1A1A gray(26,26,26)
       981: ( 27, 27, 27) #1B1B1B gray(27,27,27)
       800: ( 28, 28, 28) #1C1C1C gray(28,28,28)
       746: ( 29, 29, 29) #1D1D1D gray(29,29,29)
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      1041: ( 31, 31, 31) #1F1F1F gray(31,31,31)
      1071: ( 32, 32, 32) #202020 gray(32,32,32)
       935: ( 33, 33, 33) #212121 gray(33,33,33)
       784: ( 34, 34, 34) #222222 gray(34,34,34)
       694: ( 35, 35, 35) #232323 gray(35,35,35)
       758: ( 36, 36, 36) #242424 gray(36,36,36)
       927: ( 37, 37, 37) #252525 gray(37,37,37)
       803: ( 38, 38, 38) #262626 gray(38,38,38)
       713: ( 39, 39, 39) #272727 gray(39,39,39)
       714: ( 40, 40, 40) #282828 gray(40,40,40)
       683: ( 41, 41, 41) #292929 gray(41,41,41)
       709: ( 42, 42, 42) #2A2A2A gray(42,42,42)
       850: ( 43, 43, 43) #2B2B2B gray(43,43,43)
       780: ( 44, 44, 44) #2C2C2C gray(44,44,44)
       668: ( 45, 45, 45) #2D2D2D gray(45,45,45)
       665: ( 46, 46, 46) #2E2E2E gray(46,46,46)
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       684: ( 50, 50, 50) #323232 gray(50,50,50)
       631: ( 51, 51, 51) #333333 gray(51,51,51)
       610: ( 52, 52, 52) #343434 gray(52,52,52)
       623: ( 53, 53, 53) #353535 gray(53,53,53)
       548: ( 54, 54, 54) #363636 gray(54,54,54)
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       518: ( 62, 62, 62) #3E3E3E gray(62,62,62)
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       499: ( 65, 65, 65) #414141 gray(65,65,65)
       511: ( 66, 66, 66) #424242 gray(66,66,66)
       580: ( 67, 67, 67) #434343 gray(67,67,67)
       634: ( 68, 68, 68) #444444 gray(68,68,68)
       578: ( 69, 69, 69) #454545 gray(69,69,69)
       571: ( 70, 70, 70) #464646 gray(70,70,70)
       582: ( 71, 71, 71) #474747 gray(71,71,71)
       714: ( 72, 72, 72) #484848 gray(72,72,72)
       675: ( 73, 73, 73) #494949 gray(73,73,73)
       490: ( 74, 74, 74) #4A4A4A gray(74,74,74)
       489: ( 75, 75, 75) #4B4B4B gray(75,75,75)
       497: ( 76, 76, 76) #4C4C4C gray(76,76,76)
       478: ( 77, 77, 77) #4D4D4D gray(77,77,77)
       536: ( 78, 78, 78) #4E4E4E gray(78,78,78)
       543: ( 79, 79, 79) #4F4F4F gray(79,79,79)
       598: ( 80, 80, 80) #505050 gray(80,80,80)
       470: ( 81, 81, 81) #515151 gray(81,81,81)
       424: ( 82, 82, 82) #525252 gray(82,82,82)
       457: ( 83, 83, 83) #535353 gray(83,83,83)
       472: ( 84, 84, 84) #545454 gray(84,84,84)
       442: ( 85, 85, 85) #555555 gray(85,85,85)
       497: ( 86, 86, 86) #565656 gray(86,86,86)
       598: ( 87, 87, 87) #575757 gray(87,87,87)
       612: ( 88, 88, 88) #585858 gray(88,88,88)
       554: ( 89, 89, 89) #595959 gray(89,89,89)
       521: ( 90, 90, 90) #5A5A5A gray(90,90,90)
       494: ( 91, 91, 91) #5B5B5B gray(91,91,91)
       571: ( 92, 92, 92) #5C5C5C gray(92,92,92)
       456: ( 93, 93, 93) #5D5D5D gray(93,93,93)
       389: ( 94, 94, 94) #5E5E5E gray(94,94,94)
       479: ( 95, 95, 95) #5F5F5F gray(95,95,95)
       468: ( 96, 96, 96) #606060 gray(96,96,96)
       500: ( 97, 97, 97) #616161 gray(97,97,97)
       439: ( 98, 98, 98) #626262 gray(98,98,98)
       426: ( 99, 99, 99) #636363 gray(99,99,99)
       434: (100,100,100) #646464 gray(100,100,100)
       423: (101,101,101) #656565 gray(101,101,101)
       414: (102,102,102) #666666 gray(102,102,102)
       481: (103,103,103) #676767 gray(103,103,103)
       498: (104,104,104) #686868 gray(104,104,104)
       574: (105,105,105) #696969 gray(105,105,105)
       511: (106,106,106) #6A6A6A gray(106,106,106)
       531: (107,107,107) #6B6B6B gray(107,107,107)
       489: (108,108,108) #6C6C6C gray(108,108,108)
       478: (109,109,109) #6D6D6D gray(109,109,109)
       439: (110,110,110) #6E6E6E gray(110,110,110)
       448: (111,111,111) #6F6F6F gray(111,111,111)
       464: (112,112,112) #707070 gray(112,112,112)
       567: (113,113,113) #717171 gray(113,113,113)
       429: (114,114,114) #727272 gray(114,114,114)
       473: (115,115,115) #737373 gray(115,115,115)
       414: (116,116,116) #747474 gray(116,116,116)
       468: (117,117,117) #757575 gray(117,117,117)
       417: (118,118,118) #767676 gray(118,118,118)
       488: (119,119,119) #777777 gray(119,119,119)
       515: (120,120,120) #787878 gray(120,120,120)
       484: (121,121,121) #797979 gray(121,121,121)
       436: (122,122,122) #7A7A7A gray(122,122,122)
       479: (123,123,123) #7B7B7B gray(123,123,123)
       442: (124,124,124) #7C7C7C gray(124,124,124)
       496: (125,125,125) #7D7D7D gray(125,125,125)
       478: (126,126,126) #7E7E7E gray(126,126,126)
       411: (127,127,127) #7F7F7F gray(127,127,127)
       509: (128,128,128) #808080 gray(128,128,128)
       466: (129,129,129) #818181 gray(129,129,129)
       443: (130,130,130) #828282 gray(130,130,130)
       446: (131,131,131) #838383 gray(131,131,131)
       475: (132,132,132) #848484 gray(132,132,132)
       552: (133,133,133) #858585 gray(133,133,133)
       638: (134,134,134) #868686 gray(134,134,134)
       463: (135,135,135) #878787 gray(135,135,135)
       442: (136,136,136) #888888 gray(136,136,136)
       405: (137,137,137) #898989 gray(137,137,137)
       389: (138,138,138) #8A8A8A gray(138,138,138)
       454: (139,139,139) #8B8B8B gray(139,139,139)
       431: (140,140,140) #8C8C8C gray(140,140,140)
       429: (141,141,141) #8D8D8D gray(141,141,141)
       407: (142,142,142) #8E8E8E gray(142,142,142)
       517: (143,143,143) #8F8F8F gray(143,143,143)
       517: (144,144,144) #909090 gray(144,144,144)
       483: (145,145,145) #919191 gray(145,145,145)
       484: (146,146,146) #929292 gray(146,146,146)
       458: (147,147,147) #939393 gray(147,147,147)
       458: (148,148,148) #949494 gray(148,148,148)
       441: (149,149,149) #959595 gray(149,149,149)
       447: (150,150,150) #969696 gray(150,150,150)
       453: (151,151,151) #979797 gray(151,151,151)
       470: (152,152,152) #989898 gray(152,152,152)
       493: (153,153,153) #999999 gray(153,153,153)
       495: (154,154,154) #9A9A9A gray(154,154,154)
       410: (155,155,155) #9B9B9B gray(155,155,155)
       443: (156,156,156) #9C9C9C gray(156,156,156)
       456: (157,157,157) #9D9D9D gray(157,157,157)
       409: (158,158,158) #9E9E9E gray(158,158,158)
       471: (159,159,159) #9F9F9F gray(159,159,159)
       455: (160,160,160) #A0A0A0 gray(160,160,160)
       484: (161,161,161) #A1A1A1 gray(161,161,161)
       469: (162,162,162) #A2A2A2 gray(162,162,162)
       558: (163,163,163) #A3A3A3 gray(163,163,163)
       551: (164,164,164) #A4A4A4 gray(164,164,164)
       444: (165,165,165) #A5A5A5 gray(165,165,165)
       506: (166,166,166) #A6A6A6 gray(166,166,166)
       547: (167,167,167) #A7A7A7 gray(167,167,167)
       386: (168,168,168) #A8A8A8 gray(168,168,168)
       436: (169,169,169) #A9A9A9 gray(169,169,169)
       508: (170,170,170) #AAAAAA gray(170,170,170)
       486: (171,171,171) #ABABAB gray(171,171,171)
       444: (172,172,172) #ACACAC gray(172,172,172)
       506: (173,173,173) #ADADAD gray(173,173,173)
       562: (174,174,174) #AEAEAE gray(174,174,174)
       506: (175,175,175) #AFAFAF gray(175,175,175)
       665: (176,176,176) #B0B0B0 gray(176,176,176)
       489: (177,177,177) #B1B1B1 gray(177,177,177)
       548: (178,178,178) #B2B2B2 gray(178,178,178)
       471: (179,179,179) #B3B3B3 gray(179,179,179)
       489: (180,180,180) #B4B4B4 gray(180,180,180)
       557: (181,181,181) #B5B5B5 gray(181,181,181)
       845: (182,182,182) #B6B6B6 gray(182,182,182)
       655: (183,183,183) #B7B7B7 gray(183,183,183)
       555: (184,184,184) #B8B8B8 gray(184,184,184)
       516: (185,185,185) #B9B9B9 gray(185,185,185)
       426: (186,186,186) #BABABA gray(186,186,186)
       404: (187,187,187) #BBBBBB gray(187,187,187)
       473: (188,188,188) #BCBCBC gray(188,188,188)
       489: (189,189,189) #BDBDBD gray(189,189,189)
       489: (190,190,190) #BEBEBE gray(190,190,190)
       505: (191,191,191) #BFBFBF gray(191,191,191)
       465: (192,192,192) #C0C0C0 gray(192,192,192)
       506: (193,193,193) #C1C1C1 gray(193,193,193)
       511: (194,194,194) #C2C2C2 gray(194,194,194)
       617: (195,195,195) #C3C3C3 gray(195,195,195)
       622: (196,196,196) #C4C4C4 gray(196,196,196)
       561: (197,197,197) #C5C5C5 gray(197,197,197)
       493: (198,198,198) #C6C6C6 gray(198,198,198)
       514: (199,199,199) #C7C7C7 gray(199,199,199)
       505: (200,200,200) #C8C8C8 gray(200,200,200)
       501: (201,201,201) #C9C9C9 gray(201,201,201)
       474: (202,202,202) #CACACA gray(202,202,202)
       507: (203,203,203) #CBCBCB gray(203,203,203)
       569: (204,204,204) #CCCCCC gray(204,204,204)
       574: (205,205,205) #CDCDCD gray(205,205,205)
       591: (206,206,206) #CECECE gray(206,206,206)
       684: (207,207,207) #CFCFCF gray(207,207,207)
       753: (208,208,208) #D0D0D0 gray(208,208,208)
       596: (209,209,209) #D1D1D1 gray(209,209,209)
       505: (210,210,210) #D2D2D2 gray(210,210,210)
       543: (211,211,211) #D3D3D3 gray(211,211,211)
       561: (212,212,212) #D4D4D4 gray(212,212,212)
       641: (213,213,213) #D5D5D5 gray(213,213,213)
       602: (214,214,214) #D6D6D6 gray(214,214,214)
       545: (215,215,215) #D7D7D7 gray(215,215,215)
       585: (216,216,216) #D8D8D8 gray(216,216,216)
       639: (217,217,217) #D9D9D9 gray(217,217,217)
       711: (218,218,218) #DADADA gray(218,218,218)
       746: (219,219,219) #DBDBDB gray(219,219,219)
       631: (220,220,220) #DCDCDC gray(220,220,220)
       646: (221,221,221) #DDDDDD gray(221,221,221)
       612: (222,222,222) #DEDEDE gray(222,222,222)
       639: (223,223,223) #DFDFDF gray(223,223,223)
       743: (224,224,224) #E0E0E0 gray(224,224,224)
       598: (225,225,225) #E1E1E1 gray(225,225,225)
       598: (226,226,226) #E2E2E2 gray(226,226,226)
       596: (227,227,227) #E3E3E3 gray(227,227,227)
       630: (228,228,228) #E4E4E4 gray(228,228,228)
       743: (229,229,229) #E5E5E5 gray(229,229,229)
       654: (230,230,230) #E6E6E6 gray(230,230,230)
       983: (231,231,231) #E7E7E7 gray(231,231,231)
       999: (232,232,232) #E8E8E8 gray(232,232,232)
       751: (233,233,233) #E9E9E9 gray(233,233,233)
       756: (234,234,234) #EAEAEA gray(234,234,234)
       845: (235,235,235) #EBEBEB gray(235,235,235)
       816: (236,236,236) #ECECEC gray(236,236,236)
       742: (237,237,237) #EDEDED gray(237,237,237)
       695: (238,238,238) #EEEEEE gray(238,238,238)
       742: (239,239,239) #EFEFEF gray(239,239,239)
       738: (240,240,240) #F0F0F0 gray(240,240,240)
       856: (241,241,241) #F1F1F1 gray(241,241,241)
      1045: (242,242,242) #F2F2F2 gray(242,242,242)
      1063: (243,243,243) #F3F3F3 gray(243,243,243)
      1104: (244,244,244) #F4F4F4 gray(244,244,244)
       871: (245,245,245) #F5F5F5 gray(245,245,245)
       839: (246,246,246) #F6F6F6 gray(246,246,246)
      1034: (247,247,247) #F7F7F7 gray(247,247,247)
      1010: (248,248,248) #F8F8F8 gray(248,248,248)
      1054: (249,249,249) #F9F9F9 gray(249,249,249)
      1029: (250,250,250) #FAFAFA gray(250,250,250)
      1145: (251,251,251) #FBFBFB gray(251,251,251)
      1234: (252,252,252) #FCFCFC gray(252,252,252)
      1909: (253,253,253) #FDFDFD gray(253,253,253)
     21060: (254,254,254) #FEFEFE gray(254,254,254)
    173324: (255,255,255) #FFFFFF gray(255,255,255)
  Colormap: 256
         0: (  0,  0,  0) #000000 gray(0,0,0)
         1: (  1,  1,  1) #010101 gray(1,1,1)
         2: (  2,  2,  2) #020202 gray(2,2,2)
         3: (  3,  3,  3) #030303 gray(3,3,3)
         4: (  4,  4,  4) #040404 gray(4,4,4)
         5: (  5,  5,  5) #050505 gray(5,5,5)
         6: (  6,  6,  6) #060606 gray(6,6,6)
         7: (  7,  7,  7) #070707 gray(7,7,7)
         8: (  8,  8,  8) #080808 gray(8,8,8)
         9: (  9,  9,  9) #090909 gray(9,9,9)
        10: ( 10, 10, 10) #0A0A0A gray(10,10,10)
        11: ( 11, 11, 11) #0B0B0B gray(11,11,11)
        12: ( 12, 12, 12) #0C0C0C gray(12,12,12)
        13: ( 13, 13, 13) #0D0D0D gray(13,13,13)
        14: ( 14, 14, 14) #0E0E0E gray(14,14,14)
        15: ( 15, 15, 15) #0F0F0F gray(15,15,15)
        16: ( 16, 16, 16) #101010 gray(16,16,16)
        17: ( 17, 17, 17) #111111 gray(17,17,17)
        18: ( 18, 18, 18) #121212 gray(18,18,18)
        19: ( 19, 19, 19) #131313 gray(19,19,19)
        20: ( 20, 20, 20) #141414 gray(20,20,20)
        21: ( 21, 21, 21) #151515 gray(21,21,21)
        22: ( 22, 22, 22) #161616 gray(22,22,22)
        23: ( 23, 23, 23) #171717 gray(23,23,23)
        24: ( 24, 24, 24) #181818 gray(24,24,24)
        25: ( 25, 25, 25) #191919 gray(25,25,25)
        26: ( 26, 26, 26) #1A1A1A gray(26,26,26)
        27: ( 27, 27, 27) #1B1B1B gray(27,27,27)
        28: ( 28, 28, 28) #1C1C1C gray(28,28,28)
        29: ( 29, 29, 29) #1D1D1D gray(29,29,29)
        30: ( 30, 30, 30) #1E1E1E gray(30,30,30)
        31: ( 31, 31, 31) #1F1F1F gray(31,31,31)
        32: ( 32, 32, 32) #202020 gray(32,32,32)
        33: ( 33, 33, 33) #212121 gray(33,33,33)
        34: ( 34, 34, 34) #222222 gray(34,34,34)
        35: ( 35, 35, 35) #232323 gray(35,35,35)
        36: ( 36, 36, 36) #242424 gray(36,36,36)
        37: ( 37, 37, 37) #252525 gray(37,37,37)
        38: ( 38, 38, 38) #262626 gray(38,38,38)
        39: ( 39, 39, 39) #272727 gray(39,39,39)
        40: ( 40, 40, 40) #282828 gray(40,40,40)
        41: ( 41, 41, 41) #292929 gray(41,41,41)
        42: ( 42, 42, 42) #2A2A2A gray(42,42,42)
        43: ( 43, 43, 43) #2B2B2B gray(43,43,43)
        44: ( 44, 44, 44) #2C2C2C gray(44,44,44)
        45: ( 45, 45, 45) #2D2D2D gray(45,45,45)
        46: ( 46, 46, 46) #2E2E2E gray(46,46,46)
        47: ( 47, 47, 47) #2F2F2F gray(47,47,47)
        48: ( 48, 48, 48) #303030 gray(48,48,48)
        49: ( 49, 49, 49) #313131 gray(49,49,49)
        50: ( 50, 50, 50) #323232 gray(50,50,50)
        51: ( 51, 51, 51) #333333 gray(51,51,51)
        52: ( 52, 52, 52) #343434 gray(52,52,52)
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  Rendering intent: Undefined
  Gamma: 1
  Interlace: None
  Background color: gray(255,255,255)
  Border color: gray(223,223,223)
  Matte color: gray(189,189,189)
  Transparent color: gray(0,0,0)
  Compose: Over
  Page geometry: 1600x1200+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Zip
  Orientation: Undefined
  Properties:
    date:create: 2012-12-20T18:09:07+01:00
    date:modify: 2012-12-20T18:09:07+01:00
    png:iCCP                 : chunk was found
    png:IHDR.bit_depth       : 8
    png:IHDR.color_type      : 0 (Grayscale)
    png:IHDR.interlace_method: 0 (Not interlaced)
    png:IHDR.width,height    : 1600, 1200
    png:pHYs                 : x_res=2795, y_res=2795, units=1
    signature: 229080fa08b1795cf736a042a62965460757d3cf98402a76d54182eb2525f46f
  Profiles:
    Profile-icc: 912 bytes
      Description: Dot Gain 15%
      Manufacturer: Dot Gain 15%
      Model: Dot Gain 15%
      Copyright: Copyright 1999 Adobe Systems Incorporated
  Artifacts:
    filename: 22.png
    verbose: true
  Tainted: False
  Filesize: 317KB
  Number pixels: 1.92M
  Pixels per second: 38.4MB
  User time: 0.070u
  Elapsed time: 0:01.049
  Version: ImageMagick 6.7.7-10 2012-08-17 Q16 http://www.imagemagick.org