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convert saturation issues, different imagemagick versions

Posted: 2016-01-29T00:44:07-07:00
by denmat
Hi,

I am trying to understand what my problem is so please forgive me.

We have upgraded versions of Imagemagick. Now on some images we have colour saturation issues. I'm sorry I can't post the images because I don't own them but the older version will convert the image without issue and the new version will create a darker image.

Older version:
Linux Ubuntu Precise
convert --version
Version: ImageMagick 6.4.9-10 2012-10-23

New version:
Linux Ubuntu Trusty
convert --version
Version: ImageMagick 6.7.7-10 2014-03-06

File being 'converted' is exactly the same (on a shared filesystem that both hosts can see).

Conversion command is:

Code: Select all

convert good_thumb.png good_thumb_new.png
Running identify on the good_thumb.png file the old and the new produce different results. The things that stand out to the following:

Code: Select all

Type:
Colorspace:
Rendering intent:
.

I have tried using convert -colorspace RGB (and others) without any good result. What we are trying to do is resize the images to thumbnails. I have use other .png files and I don't see the problem, .jpg file are fine too. I am trying to identify the cause of the problem so we can fix it or understand what to do about it.

Old:

Code: Select all

Image: good_thumb.png
  Format: PNG (Portable Network Graphics)
  Class: DirectClass
  Geometry: 80x80+0+0
  Resolution: 37.79x37.79
  Print size: 2.11696x2.11696
  Units: PixelsPerCentimeter
  Type: GrayscaleMatte
  Base type: GrayscaleMatte
  Endianess: Undefined
  Colorspace: RGB
  Depth: 8-bit
  Channel depth:
    gray: 8-bit
    alpha: 8-bit
  Channel statistics:
    gray:
      min: 0 (0)
      max: 255 (1)
      mean: 65.4003 (0.256472)
      standard deviation: 50.6953 (0.198805)
      kurtosis: 3.5053
      skewness: 1.54843
    alpha:
      min: 0 (0)
      max: 255 (1)
      mean: 201.26 (0.789254)
      standard deviation: 101.834 (0.399347)
      kurtosis: 0.0651124
      skewness: 1.42028
  Alpha: none   #00000000
  Histogram:
      3052: ( 63, 63, 63,255) #3F3F3F rgba(63,63,63,1)
      1204: (  0,  0,  0,  0) #00000000 none
       135: ( 62, 62, 62,255) #3E3E3E rgba(62,62,62,1)
       100: ( 67, 67, 67,255) #434343 rgba(67,67,67,1)
        89: ( 60, 60, 60,255) #3C3C3C rgba(60,60,60,1)
        73: ( 58, 58, 58,255) #3A3A3A rgba(58,58,58,1)
        71: ( 57, 57, 57,255) #393939 rgba(57,57,57,1)
        63: ( 59, 59, 59,255) #3B3B3B grey23
        60: ( 64, 64, 64,255) #404040 grey25
        57: ( 66, 66, 66,255) #424242 grey26
        52: ( 76, 76, 76,255) #4C4C4C rgba(76,76,76,1)
        51: ( 61, 61, 61,255) #3D3D3D grey24
        45: (156,156,156,255) #9C9C9C grey61
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        40: ( 65, 65, 65,255) #414141 rgba(65,65,65,1)
        27: ( 54, 54, 54,255) #363636 grey21
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         7: (217,217,217,255) #D9D9D9 grey85
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         6: ( 49, 49, 49,255) #313131 rgba(49,49,49,1)
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         6: ( 74, 74, 74,255) #4A4A4A grey29
         6: ( 81, 81, 81,255) #515151 rgba(81,81,81,1)
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         6: (117,117,117,255) #757575 grey46
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         6: (197,197,197,255) #C5C5C5 rgba(197,197,197,1)
         6: (201,201,201,255) #C9C9C9 grey79
         6: (202,202,202,255) #CACACA rgba(202,202,202,1)
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         5: (125,125,125,255) #7D7D7D grey49
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         5: (147,147,147,255) #939393 rgba(147,147,147,1)
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         5: (154,154,154,255) #9A9A9A rgba(154,154,154,1)
         5: (158,158,158,255) #9E9E9E grey62
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         5: (164,164,164,255) #A4A4A4 rgba(164,164,164,1)
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         5: (187,187,187,255) #BBBBBB rgba(187,187,187,1)
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         4: ( 66, 66, 66,249) #424242F9 rgba(66,66,66,0.976471)
         4: ( 67, 67, 67,234) #434343EA rgba(67,67,67,0.917647)
         4: (110,110,110,255) #6E6E6E grey43
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    create-date: 2016-01-28T22:10:49+00:00
    modify-date: 2016-01-28T22:10:48+00:00
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New

Code: Select all

Image: good_thumb.png
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         1: ( 67, 67, 67,233) #434343E9 srgba(67,67,67,0.913725)
         1: ( 67, 67, 67,227) #434343E3 srgba(67,67,67,0.890196)
         1: ( 67, 67, 67,224) #434343E0 srgba(67,67,67,0.878431)
         1: ( 67, 67, 67,223) #434343DF srgba(67,67,67,0.87451)
         1: ( 67, 67, 67,214) #434343D6 srgba(67,67,67,0.839216)
         8: ( 68, 68, 68,255) #444444 srgba(68,68,68,1)
         2: ( 68, 68, 68,245) #444444F5 srgba(68,68,68,0.960784)
         2: ( 68, 68, 68,235) #444444EB srgba(68,68,68,0.921569)
         2: ( 68, 68, 68,232) #444444E8 srgba(68,68,68,0.909804)
         2: ( 68, 68, 68,213) #444444D5 srgba(68,68,68,0.835294)
         1: ( 68, 68, 68,237) #444444ED srgba(68,68,68,0.929412)
         1: ( 68, 68, 68,227) #444444E3 srgba(68,68,68,0.890196)
         1: ( 68, 68, 68,226) #444444E2 srgba(68,68,68,0.886275)
         1: ( 68, 68, 68,223) #444444DF srgba(68,68,68,0.87451)
         1: ( 68, 68, 68,219) #444444DB srgba(68,68,68,0.858824)
         1: ( 68, 68, 68,216) #444444D8 srgba(68,68,68,0.847059)
         1: ( 68, 68, 68,205) #444444CD srgba(68,68,68,0.803922)
         5: ( 69, 69, 69,255) #454545 grey27
         2: ( 69, 69, 69,224) #454545E0 srgba(69,69,69,0.878431)
         2: ( 69, 69, 69,216) #454545D8 srgba(69,69,69,0.847059)
         2: ( 69, 69, 69,205) #454545CD srgba(69,69,69,0.803922)
         2: ( 69, 69, 69,195) #454545C3 srgba(69,69,69,0.764706)
         2: ( 69, 69, 69,184) #454545B8 srgba(69,69,69,0.721569)
         1: ( 69, 69, 69,246) #454545F6 srgba(69,69,69,0.964706)
         1: ( 69, 69, 69,241) #454545F1 srgba(69,69,69,0.945098)
         1: ( 69, 69, 69,235) #454545EB srgba(69,69,69,0.921569)
         1: ( 69, 69, 69,232) #454545E8 srgba(69,69,69,0.909804)
         1: ( 69, 69, 69,227) #454545E3 srgba(69,69,69,0.890196)
         1: ( 69, 69, 69,225) #454545E1 srgba(69,69,69,0.882353)
         1: ( 69, 69, 69,219) #454545DB srgba(69,69,69,0.858824)
         1: ( 69, 69, 69,218) #454545DA srgba(69,69,69,0.854902)
         1: ( 69, 69, 69,217) #454545D9 srgba(69,69,69,0.85098)
         1: ( 69, 69, 69,214) #454545D6 srgba(69,69,69,0.839216)
         1: ( 69, 69, 69,212) #454545D4 srgba(69,69,69,0.831373)
         1: ( 69, 69, 69,206) #454545CE srgba(69,69,69,0.807843)
         1: ( 69, 69, 69,198) #454545C6 srgba(69,69,69,0.776471)
         1: ( 69, 69, 69,186) #454545BA srgba(69,69,69,0.729412)
         6: ( 70, 70, 70,255) #464646 srgba(70,70,70,1)
         2: ( 70, 70, 70,194) #464646C2 srgba(70,70,70,0.760784)
         2: ( 70, 70, 70,169) #464646A9 srgba(70,70,70,0.662745)
         1: ( 70, 70, 70,245) #464646F5 srgba(70,70,70,0.960784)
         1: ( 70, 70, 70,240) #464646F0 srgba(70,70,70,0.941176)
         1: ( 70, 70, 70,235) #464646EB srgba(70,70,70,0.921569)
         1: ( 70, 70, 70,209) #464646D1 srgba(70,70,70,0.819608)
         1: ( 70, 70, 70,205) #464646CD srgba(70,70,70,0.803922)
         1: ( 70, 70, 70,195) #464646C3 srgba(70,70,70,0.764706)
         1: ( 70, 70, 70,192) #464646C0 srgba(70,70,70,0.752941)
         1: ( 70, 70, 70,191) #464646BF srgba(70,70,70,0.74902)
         1: ( 70, 70, 70,188) #464646BC srgba(70,70,70,0.737255)
         1: ( 70, 70, 70,189) #464646BD srgba(70,70,70,0.741176)
         1: ( 70, 70, 70,187) #464646BB srgba(70,70,70,0.733333)
         9: ( 71, 71, 71,255) #474747 grey28
         2: ( 71, 71, 71,190) #474747BE srgba(71,71,71,0.745098)
         2: ( 71, 71, 71,186) #474747BA srgba(71,71,71,0.729412)
         1: ( 71, 71, 71,197) #474747C5 srgba(71,71,71,0.772549)
         1: ( 71, 71, 71,189) #474747BD srgba(71,71,71,0.741176)
         1: ( 71, 71, 71,171) #474747AB srgba(71,71,71,0.670588)
         5: ( 72, 72, 72,255) #484848 srgba(72,72,72,1)
         2: ( 72, 72, 72,191) #484848BF srgba(72,72,72,0.74902)
         2: ( 72, 72, 72,152) #48484898 srgba(72,72,72,0.596078)
         1: ( 72, 72, 72,190) #484848BE srgba(72,72,72,0.745098)
         1: ( 72, 72, 72,187) #484848BB srgba(72,72,72,0.733333)
         1: ( 72, 72, 72,177) #484848B1 srgba(72,72,72,0.694118)
         1: ( 72, 72, 72,173) #484848AD srgba(72,72,72,0.678431)
         1: ( 72, 72, 72,172) #484848AC srgba(72,72,72,0.67451)
         1: ( 72, 72, 72,162) #484848A2 srgba(72,72,72,0.635294)
        11: ( 73, 73, 73,255) #494949 srgba(73,73,73,1)
         3: ( 73, 73, 73,162) #494949A2 srgba(73,73,73,0.635294)
         2: ( 73, 73, 73,164) #494949A4 srgba(73,73,73,0.643137)
         2: ( 73, 73, 73,163) #494949A3 srgba(73,73,73,0.639216)
         1: ( 73, 73, 73,240) #494949F0 srgba(73,73,73,0.941176)
         1: ( 73, 73, 73,239) #494949EF srgba(73,73,73,0.937255)
         1: ( 73, 73, 73,173) #494949AD srgba(73,73,73,0.678431)
         1: ( 73, 73, 73,160) #494949A0 srgba(73,73,73,0.627451)
         1: ( 73, 73, 73,159) #4949499F srgba(73,73,73,0.623529)
         1: ( 73, 73, 73,152) #49494998 srgba(73,73,73,0.596078)
         6: ( 74, 74, 74,255) #4A4A4A grey29
         2: ( 74, 74, 74,158) #4A4A4A9E srgba(74,74,74,0.619608)
         2: ( 74, 74, 74,157) #4A4A4A9D srgba(74,74,74,0.615686)
         2: ( 74, 74, 74,134) #4A4A4A86 srgba(74,74,74,0.52549)
         1: ( 74, 74, 74,174) #4A4A4AAE srgba(74,74,74,0.682353)
         1: ( 74, 74, 74,168) #4A4A4AA8 srgba(74,74,74,0.658824)
         1: ( 74, 74, 74,151) #4A4A4A97 srgba(74,74,74,0.592157)
         1: ( 74, 74, 74,148) #4A4A4A94 srgba(74,74,74,0.580392)
         8: ( 75, 75, 75,255) #4B4B4B srgba(75,75,75,1)
         3: ( 75, 75, 75,135) #4B4B4B87 srgba(75,75,75,0.529412)
         2: ( 75, 75, 75,115) #4B4B4B73 srgba(75,75,75,0.45098)
         1: ( 75, 75, 75,173) #4B4B4BAD srgba(75,75,75,0.678431)
         1: ( 75, 75, 75,159) #4B4B4B9F srgba(75,75,75,0.623529)
         1: ( 75, 75, 75,149) #4B4B4B95 srgba(75,75,75,0.584314)
         1: ( 75, 75, 75,128) #4B4B4B80 srgba(75,75,75,0.501961)
         1: ( 75, 75, 75,121) #4B4B4B79 srgba(75,75,75,0.47451)
        52: ( 76, 76, 76,255) #4C4C4C srgba(76,76,76,1)
         2: ( 76, 76, 76, 93) #4C4C4C5D srgba(76,76,76,0.364706)
         1: ( 76, 76, 76,146) #4C4C4C92 srgba(76,76,76,0.572549)
         1: ( 76, 76, 76,136) #4C4C4C88 srgba(76,76,76,0.533333)
         1: ( 76, 76, 76,134) #4C4C4C86 srgba(76,76,76,0.52549)
         1: ( 76, 76, 76,133) #4C4C4C85 srgba(76,76,76,0.521569)
         3: ( 77, 77, 77,125) #4D4D4D7D srgba(77,77,77,0.490196)
         3: ( 77, 77, 77,121) #4D4D4D79 srgba(77,77,77,0.47451)
         2: ( 77, 77, 77,255) #4D4D4D grey30
         2: ( 77, 77, 77,139) #4D4D4D8B srgba(77,77,77,0.545098)
         2: ( 77, 77, 77,122) #4D4D4D7A srgba(77,77,77,0.478431)
         1: ( 77, 77, 77,230) #4D4D4DE6 srgba(77,77,77,0.901961)
         1: ( 77, 77, 77,231) #4D4D4DE7 srgba(77,77,77,0.905882)
         1: ( 77, 77, 77,190) #4D4D4DBE srgba(77,77,77,0.745098)
         1: ( 77, 77, 77,149) #4D4D4D95 srgba(77,77,77,0.584314)
         1: ( 77, 77, 77,118) #4D4D4D76 srgba(77,77,77,0.462745)
         1: ( 77, 77, 77,108) #4D4D4D6C srgba(77,77,77,0.423529)
         5: ( 78, 78, 78,255) #4E4E4E srgba(78,78,78,1)
         1: ( 78, 78, 78,191) #4E4E4EBF srgba(78,78,78,0.74902)
         1: ( 78, 78, 78,127) #4E4E4E7F srgba(78,78,78,0.498039)
         1: ( 78, 78, 78,124) #4E4E4E7C srgba(78,78,78,0.486275)
         1: ( 78, 78, 78,111) #4E4E4E6F srgba(78,78,78,0.435294)
         8: ( 79, 79, 79,255) #4F4F4F grey31
         1: ( 79, 79, 79,151) #4F4F4F97 srgba(79,79,79,0.592157)
         1: ( 79, 79, 79,116) #4F4F4F74 srgba(79,79,79,0.454902)
         1: ( 79, 79, 79,112) #4F4F4F70 srgba(79,79,79,0.439216)
         1: ( 79, 79, 79,109) #4F4F4F6D srgba(79,79,79,0.427451)
         1: ( 79, 79, 79,106) #4F4F4F6A srgba(79,79,79,0.415686)
         7: ( 80, 80, 80,255) #505050 srgba(80,80,80,1)
         2: ( 80, 80, 80,102) #50505066 srgba(80,80,80,0.4)
         1: ( 80, 80, 80,152) #50505098 srgba(80,80,80,0.596078)
         1: ( 80, 80, 80, 89) #50505059 srgba(80,80,80,0.34902)
         1: ( 80, 80, 80, 79) #5050504F srgba(80,80,80,0.309804)
         6: ( 81, 81, 81,255) #515151 srgba(81,81,81,1)
         2: ( 81, 81, 81,219) #515151DB srgba(81,81,81,0.858824)
         2: ( 81, 81, 81, 72) #51515148 srgba(81,81,81,0.282353)
         1: ( 81, 81, 81,110) #5151516E srgba(81,81,81,0.431373)
         1: ( 81, 81, 81, 88) #51515158 srgba(81,81,81,0.345098)
         1: ( 81, 81, 81, 84) #51515154 srgba(81,81,81,0.329412)
         1: ( 81, 81, 81, 69) #51515145 srgba(81,81,81,0.270588)
        16: ( 82, 82, 82,255) #525252 grey32
         1: ( 82, 82, 82,206) #525252CE srgba(82,82,82,0.807843)
         1: ( 82, 82, 82,204) #525252CC srgba(82,82,82,0.8)
         1: ( 82, 82, 82, 87) #52525257 srgba(82,82,82,0.341176)
         1: ( 82, 82, 82, 83) #52525253 srgba(82,82,82,0.32549)
         1: ( 82, 82, 82, 77) #5252524D srgba(82,82,82,0.301961)
         1: ( 82, 82, 82, 71) #52525247 srgba(82,82,82,0.278431)
         1: ( 82, 82, 82, 68) #52525244 srgba(82,82,82,0.266667)
         8: ( 83, 83, 83,255) #535353 srgba(83,83,83,1)
         2: ( 83, 83, 83, 86) #53535356 srgba(83,83,83,0.337255)
         1: ( 83, 83, 83, 79) #5353534F srgba(83,83,83,0.309804)
         1: ( 83, 83, 83, 76) #5353534C srgba(83,83,83,0.298039)
         1: ( 83, 83, 83, 70) #53535346 srgba(83,83,83,0.27451)
         3: ( 84, 84, 84,255) #545454 grey33
         2: ( 84, 84, 84, 72) #54545448 srgba(84,84,84,0.282353)
         1: ( 84, 84, 84, 84) #54545454 srgba(84,84,84,0.329412)
         1: ( 84, 84, 84, 81) #54545451 srgba(84,84,84,0.317647)
         1: ( 84, 84, 84, 63) #5454543F srgba(84,84,84,0.247059)
         1: ( 84, 84, 84, 45) #5454542D srgba(84,84,84,0.176471)
         2: ( 85, 85, 85,255) #555555 srgba(85,85,85,1)
         1: ( 85, 85, 85,  3) #55555503 srgba(85,85,85,0.0117647)
         7: ( 86, 86, 86,255) #565656 srgba(86,86,86,1)
         2: ( 86, 86, 86, 68) #56565644 srgba(86,86,86,0.266667)
         1: ( 86, 86, 86, 74) #5656564A srgba(86,86,86,0.290196)
         1: ( 86, 86, 86, 65) #56565641 srgba(86,86,86,0.254902)
         1: ( 86, 86, 86, 62) #5656563E srgba(86,86,86,0.243137)
         5: ( 87, 87, 87,255) #575757 grey34
         1: ( 87, 87, 87, 70) #57575746 srgba(87,87,87,0.27451)
         1: ( 87, 87, 87, 67) #57575743 srgba(87,87,87,0.262745)
         1: ( 87, 87, 87, 61) #5757573D srgba(87,87,87,0.239216)
         7: ( 88, 88, 88,255) #585858 srgba(88,88,88,1)
         3: ( 88, 88, 88, 52) #58585834 srgba(88,88,88,0.203922)
         1: ( 88, 88, 88,129) #58585881 srgba(88,88,88,0.505882)
         1: ( 88, 88, 88, 81) #58585851 srgba(88,88,88,0.317647)
         1: ( 88, 88, 88, 55) #58585837 srgba(88,88,88,0.215686)
         8: ( 89, 89, 89,255) #595959 grey35
         1: ( 89, 89, 89,128) #59595980 srgba(89,89,89,0.501961)
         1: ( 89, 89, 89, 57) #59595939 srgba(89,89,89,0.223529)
         1: ( 89, 89, 89, 40) #59595928 srgba(89,89,89,0.156863)
        12: ( 90, 90, 90,255) #5A5A5A srgba(90,90,90,1)
         3: ( 90, 90, 90, 59) #5A5A5A3B srgba(90,90,90,0.231373)
         1: ( 90, 90, 90, 82) #5A5A5A52 srgba(90,90,90,0.321569)
         1: ( 90, 90, 90, 62) #5A5A5A3E srgba(90,90,90,0.243137)
         1: ( 90, 90, 90, 45) #5A5A5A2D srgba(90,90,90,0.176471)
         6: ( 91, 91, 91,255) #5B5B5B srgba(91,91,91,1)
         3: ( 91, 91, 91, 50) #5B5B5B32 srgba(91,91,91,0.196078)
         1: ( 91, 91, 91, 42) #5B5B5B2A srgba(91,91,91,0.164706)
         3: ( 92, 92, 92, 44) #5C5C5C2C srgba(92,92,92,0.172549)
         2: ( 92, 92, 92,255) #5C5C5C grey36
         2: ( 92, 92, 92, 47) #5C5C5C2F srgba(92,92,92,0.184314)
         1: ( 92, 92, 92,105) #5C5C5C69 srgba(92,92,92,0.411765)
         1: ( 92, 92, 92, 55) #5C5C5C37 srgba(92,92,92,0.215686)
         6: ( 93, 93, 93,255) #5D5D5D srgba(93,93,93,1)
         1: ( 93, 93, 93,104) #5D5D5D68 srgba(93,93,93,0.407843)
         1: ( 93, 93, 93, 30) #5D5D5D1E srgba(93,93,93,0.117647)
         7: ( 94, 94, 94,255) #5E5E5E grey37
         1: ( 94, 94, 94, 27) #5E5E5E1B srgba(94,94,94,0.105882)
         6: ( 95, 95, 95,255) #5F5F5F srgba(95,95,95,1)
         1: ( 95, 95, 95, 32) #5F5F5F20 srgba(95,95,95,0.12549)
         5: ( 96, 96, 96,255) #606060 srgba(96,96,96,1)
         1: ( 96, 96, 96, 29) #6060601D srgba(96,96,96,0.113725)
         3: ( 97, 97, 97,255) #616161 grey38
         1: ( 97, 97, 97, 34) #61616122 srgba(97,97,97,0.133333)
        10: ( 98, 98, 98,255) #626262 srgba(98,98,98,1)
         7: ( 99, 99, 99,255) #636363 grey39
         1: ( 99, 99, 99, 41) #63636329 srgba(99,99,99,0.160784)
         1: ( 99, 99, 99, 36) #63636324 srgba(99,99,99,0.141176)
         3: (100,100,100,255) #646464 srgba(100,100,100,1)
         1: (100,100,100, 33) #64646421 srgba(100,100,100,0.129412)
         1: (101,101,101,255) #656565 srgba(101,101,101,1)
         1: (101,101,101, 25) #65656519 srgba(101,101,101,0.0980392)
         3: (102,102,102, 30) #6666661E srgba(102,102,102,0.117647)
         2: (102,102,102,255) #666666 grey40
         2: (102,102,102, 20) #66666614 srgba(102,102,102,0.0784314)
         1: (102,102,102, 40) #66666628 srgba(102,102,102,0.156863)
         2: (103,103,103, 27) #6767671B srgba(103,103,103,0.105882)
         3: (104,104,104,255) #686868 srgba(104,104,104,1)
         2: (104,104,104, 22) #68686816 srgba(104,104,104,0.0862745)
         2: (105,105,105,255) #696969 DimGray
         7: (106,106,106,255) #6A6A6A srgba(106,106,106,1)
         2: (106,106,106, 24) #6A6A6A18 srgba(106,106,106,0.0941176)
         5: (107,107,107,255) #6B6B6B grey42
         1: (107,107,107, 26) #6B6B6B1A srgba(107,107,107,0.101961)
         2: (108,108,108,255) #6C6C6C srgba(108,108,108,1)
         3: (109,109,109,255) #6D6D6D srgba(109,109,109,1)
         1: (109,109,109, 21) #6D6D6D15 srgba(109,109,109,0.0823529)
         4: (110,110,110,255) #6E6E6E grey43
         1: (110,110,110, 23) #6E6E6E17 srgba(110,110,110,0.0901961)
         9: (111,111,111,255) #6F6F6F srgba(111,111,111,1)
         4: (113,113,113,255) #717171 srgba(113,113,113,1)
         1: (113,113,113, 18) #71717112 srgba(113,113,113,0.0705882)
         1: (114,114,114,255) #727272 srgba(114,114,114,1)
         2: (115,115,115, 11) #7373730B srgba(115,115,115,0.0431373)
         1: (115,115,115,255) #737373 grey45
         1: (115,115,115, 22) #73737316 srgba(115,115,115,0.0862745)
         4: (116,116,116,255) #747474 srgba(116,116,116,1)
         6: (117,117,117,255) #757575 grey46
         1: (117,117,117, 13) #7575750D srgba(117,117,117,0.0509804)
         7: (118,118,118,255) #767676 srgba(118,118,118,1)
         7: (119,119,119,255) #777777 srgba(119,119,119,1)
         8: (120,120,120,255) #787878 grey47
         1: (121,121,121,255) #797979 srgba(121,121,121,1)
         1: (121,121,121, 23) #79797917 srgba(121,121,121,0.0901961)
         1: (121,121,121, 21) #79797915 srgba(121,121,121,0.0823529)
         1: (122,122,122,255) #7A7A7A grey48
         1: (123,123,123,255) #7B7B7B srgba(123,123,123,1)
         5: (124,124,124,255) #7C7C7C srgba(124,124,124,1)
         5: (125,125,125,255) #7D7D7D grey49
         4: (126,126,126,255) #7E7E7E gray
         6: (127,127,127,255) #7F7F7F grey50
         1: (127,127,127, 14) #7F7F7F0E srgba(127,127,127,0.054902)
         3: (128,128,128,255) #808080 fractal
         4: (129,129,129,255) #818181 srgba(129,129,129,1)
         3: (130,130,130,255) #828282 grey51
         3: (131,131,131,255) #838383 srgba(131,131,131,1)
         1: (132,132,132,255) #848484 srgba(132,132,132,1)
         4: (133,133,133,255) #858585 grey52
         2: (134,134,134,255) #868686 srgba(134,134,134,1)
         2: (135,135,135,255) #878787 grey53
         2: (136,136,136,255) #888888 srgba(136,136,136,1)
         1: (137,137,137,255) #898989 srgba(137,137,137,1)
        12: (138,138,138,255) #8A8A8A grey54
         4: (139,139,139,255) #8B8B8B srgba(139,139,139,1)
         1: (139,139,139, 11) #8B8B8B0B srgba(139,139,139,0.0431373)
         4: (140,140,140,255) #8C8C8C grey55
         7: (141,141,141,255) #8D8D8D srgba(141,141,141,1)
         2: (141,141,141,  9) #8D8D8D09 srgba(141,141,141,0.0352941)
         3: (142,142,142,255) #8E8E8E srgba(142,142,142,1)
         5: (143,143,143,255) #8F8F8F grey56
         3: (144,144,144,255) #909090 srgba(144,144,144,1)
         4: (145,145,145,255) #919191 grey57
         4: (146,146,146,255) #929292 srgba(146,146,146,1)
         5: (147,147,147,255) #939393 srgba(147,147,147,1)
         3: (148,148,148,255) #949494 grey58
         1: (148,148,148, 12) #9494940C srgba(148,148,148,0.0470588)
         7: (149,149,149,255) #959595 srgba(149,149,149,1)
         5: (150,150,150,255) #969696 grey59
         1: (151,151,151,255) #979797 srgba(151,151,151,1)
         6: (153,153,153,255) #999999 grey60
         2: (153,153,153,  5) #99999905 srgba(153,153,153,0.0196078)
         5: (154,154,154,255) #9A9A9A srgba(154,154,154,1)
         3: (155,155,155,255) #9B9B9B srgba(155,155,155,1)
        45: (156,156,156,255) #9C9C9C grey61
         2: (157,157,157,255) #9D9D9D srgba(157,157,157,1)
         5: (158,158,158,255) #9E9E9E grey62
         4: (159,159,159,255) #9F9F9F srgba(159,159,159,1)
         3: (159,159,159,  8) #9F9F9F08 srgba(159,159,159,0.0313725)
         7: (160,160,160,255) #A0A0A0 srgba(160,160,160,1)
         1: (162,162,162,255) #A2A2A2 srgba(162,162,162,1)
         5: (163,163,163,255) #A3A3A3 grey64
         5: (164,164,164,255) #A4A4A4 srgba(164,164,164,1)
         1: (165,165,165,255) #A5A5A5 srgba(165,165,165,1)
         2: (166,166,166,255) #A6A6A6 grey65
         2: (168,168,168,255) #A8A8A8 grey66
         2: (169,169,169,255) #A9A9A9 DarkGray
         4: (170,170,170,  3) #AAAAAA03 srgba(170,170,170,0.0117647)
         2: (170,170,170,255) #AAAAAA srgba(170,170,170,1)
         1: (170,170,170,  6) #AAAAAA06 srgba(170,170,170,0.0235294)
         2: (171,171,171,255) #ABABAB grey67
         4: (172,172,172,255) #ACACAC srgba(172,172,172,1)
         1: (173,173,173,255) #ADADAD grey68
         1: (174,174,174,255) #AEAEAE srgba(174,174,174,1)
         4: (175,175,175,255) #AFAFAF srgba(175,175,175,1)
        12: (176,176,176,255) #B0B0B0 grey69
         6: (177,177,177,255) #B1B1B1 srgba(177,177,177,1)
         6: (178,178,178,255) #B2B2B2 srgba(178,178,178,1)
         3: (179,179,179,255) #B3B3B3 grey70
         5: (180,180,180,255) #B4B4B4 srgba(180,180,180,1)
         2: (181,181,181,255) #B5B5B5 grey71
        11: (182,182,182,255) #B6B6B6 srgba(182,182,182,1)
         4: (183,183,183,255) #B7B7B7 srgba(183,183,183,1)
         2: (184,184,184,255) #B8B8B8 grey72
         3: (185,185,185,255) #B9B9B9 srgba(185,185,185,1)
         4: (186,186,186,255) #BABABA grey73
         5: (187,187,187,255) #BBBBBB srgba(187,187,187,1)
         4: (188,188,188,255) #BCBCBC srgba(188,188,188,1)
         3: (189,189,189,255) #BDBDBD grey74
         4: (190,190,190,255) #BEBEBE grey
         3: (191,191,191,  4) #BFBFBF04 srgba(191,191,191,0.0156863)
         1: (191,191,191,255) #BFBFBF grey75
         1: (191,191,191,  8) #BFBFBF08 srgba(191,191,191,0.0313725)
         2: (192,192,192,255) #C0C0C0 silver
         1: (193,193,193,255) #C1C1C1 srgba(193,193,193,1)
         4: (194,194,194,255) #C2C2C2 grey76
         3: (195,195,195,255) #C3C3C3 srgba(195,195,195,1)
         6: (196,196,196,255) #C4C4C4 grey77
         6: (197,197,197,255) #C5C5C5 srgba(197,197,197,1)
         4: (198,198,198,255) #C6C6C6 srgba(198,198,198,1)
         3: (199,199,199,255) #C7C7C7 grey78
         9: (200,200,200,255) #C8C8C8 srgba(200,200,200,1)
         6: (201,201,201,255) #C9C9C9 grey79
         6: (202,202,202,255) #CACACA srgba(202,202,202,1)
         4: (203,203,203,255) #CBCBCB srgba(203,203,203,1)
         9: (204,204,204,255) #CCCCCC grey80
         4: (205,205,205,255) #CDCDCD srgba(205,205,205,1)
         1: (206,206,206,255) #CECECE srgba(206,206,206,1)
         4: (207,207,207,255) #CFCFCF grey81
         5: (208,208,208,255) #D0D0D0 srgba(208,208,208,1)
         3: (209,209,209,255) #D1D1D1 grey82
         6: (210,210,210,255) #D2D2D2 srgba(210,210,210,1)
         2: (211,211,211,255) #D3D3D3 LightGray
         6: (212,212,212,255) #D4D4D4 grey83
         6: (213,213,213,255) #D5D5D5 srgba(213,213,213,1)
         4: (214,214,214,255) #D6D6D6 grey84
         3: (215,215,215,255) #D7D7D7 srgba(215,215,215,1)
        10: (216,216,216,255) #D8D8D8 srgba(216,216,216,1)
         7: (217,217,217,255) #D9D9D9 grey85
         6: (218,218,218,255) #DADADA srgba(218,218,218,1)
         2: (219,219,219,255) #DBDBDB grey86
         7: (220,220,220,255) #DCDCDC gainsboro
         3: (221,221,221,255) #DDDDDD srgba(221,221,221,1)
         4: (222,222,222,255) #DEDEDE grey87
         4: (223,223,223,255) #DFDFDF srgba(223,223,223,1)
         4: (224,224,224,255) #E0E0E0 grey88
         8: (225,225,225,255) #E1E1E1 srgba(225,225,225,1)
         3: (226,226,226,255) #E2E2E2 srgba(226,226,226,1)
         3: (227,227,227,255) #E3E3E3 grey89
         2: (228,228,228,255) #E4E4E4 srgba(228,228,228,1)
         2: (229,229,229,255) #E5E5E5 grey90
         6: (230,230,230,255) #E6E6E6 srgba(230,230,230,1)
         1: (231,231,231,255) #E7E7E7 srgba(231,231,231,1)
         6: (232,232,232,255) #E8E8E8 grey91
         6: (233,233,233,255) #E9E9E9 srgba(233,233,233,1)
         1: (234,234,234,255) #EAEAEA srgba(234,234,234,1)
         3: (235,235,235,255) #EBEBEB grey92
         2: (236,236,236,255) #ECECEC srgba(236,236,236,1)
         2: (237,237,237,255) #EDEDED grey93
         5: (238,238,238,255) #EEEEEE srgba(238,238,238,1)
         2: (239,239,239,255) #EFEFEF srgba(239,239,239,1)
         6: (240,240,240,255) #F0F0F0 grey94
         3: (241,241,241,255) #F1F1F1 srgba(241,241,241,1)
         3: (242,242,242,255) #F2F2F2 grey95
         2: (243,243,243,255) #F3F3F3 srgba(243,243,243,1)
         5: (244,244,244,255) #F4F4F4 srgba(244,244,244,1)
         6: (245,245,245,255) #F5F5F5 grey96
         8: (246,246,246,255) #F6F6F6 srgba(246,246,246,1)
         6: (247,247,247,255) #F7F7F7 grey97
         6: (248,248,248,255) #F8F8F8 srgba(248,248,248,1)
         9: (249,249,249,255) #F9F9F9 srgba(249,249,249,1)
        11: (250,250,250,255) #FAFAFA grey98
         4: (251,251,251,255) #FBFBFB srgba(251,251,251,1)
         6: (252,252,252,255) #FCFCFC grey99
         6: (253,253,253,255) #FDFDFD srgba(253,253,253,1)
         4: (254,254,254,255) #FEFEFE srgba(254,254,254,1)
        11: (255,255,255,255) #FFFFFF white
         4: (255,255,255,  2) #FFFFFF02 srgba(255,255,255,0.00784314)
         3: (255,255,255,  1) #FFFFFF01 srgba(255,255,255,0.00392157)
         1: (255,255,255,  3) #FFFFFF03 srgba(255,255,255,0.0117647)
  Rendering intent: Perceptual
  Gamma: 0.45455
  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)
  Interlace: None
  Background color: black
  Border color: srgba(223,223,223,1)
  Matte color: grey74
  Transparent color: none
  Compose: Over
  Page geometry: 80x80+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Zip
  Orientation: Undefined
  Properties:
    create-date: 2015-11-13T17:33:02+00:00
    date:create: 2016-01-29T09:10:49+11:00
    date:modify: 2016-01-29T09:10:48+11:00
    modify-date: 2015-11-13T17:33:02+00:00
    png:bKGD                 : chunk was found (see Background color, above)
    png:cHRM                 : chunk was found (see Chromaticity, above)
    png:gAMA                 : gamma=0.45454544 (See Gamma, above)
    png:IHDR.bit_depth       : 8
    png:IHDR.color_type      : 6 (RGBA)
    png:IHDR.interlace_method: 0 (Not interlaced)
    png:IHDR.width,height    : 80, 80
    png:pHYs                 : x_res=3779, y_res=3779, units=1
    png:sRGB                 : intent=0 (See Rendering intent)
    png:text                 : 2 tEXt/zTXt/iTXt chunks were found
    signature: f9b83d8b716207a7867649a7e86a27af54c4832511fb93f5f5d056483737d11a
  Artifacts:
    filename: good_thumb.png
    verbose: true
  Tainted: False
  Filesize: 6.55KB
  Number pixels: 6.4K
  Pixels per second: 0B
  User time: 0.000u
  Elapsed time: 0:01.000
  Version: ImageMagick 6.7.7-10 2014-03-06 Q16 http://www.imagemagick.org
Thanks for any help.

Den

Re: convert saturation issues, different imagemagick versions

Posted: 2016-01-29T01:58:50-07:00
by snibgo
What do you mean by "saturation issues"? The listings from "identify verbose" show that both images are grayscale, with no colour. Thus, saturation is zero for both.

They also show identical channel statistics to each other. The "new" colour version has the same values in all three channels. The gammas are the same. I haven't checked the entire histogram, but they seem to be the same, just in a different order.

Versions around 6.7.7 were confused by grayscale images, and would make then linear RGB instead of non-linear sRGB. Software that assumed (incorrectly) that they were sRGB would show them as "too dark".

Do you get the problem with colour images, or only with grayscale?

Re: convert saturation issues, different imagemagick versions

Posted: 2016-01-29T15:32:44-07:00
by denmat
Sorry,
Software that assumed (incorrectly) that they were sRGB would show them as "too dark".
That is actually the problem! I will see if I can find a updated version and report back.

Thank you.

Re: convert saturation issues, different imagemagick versions

Posted: 2016-01-29T15:40:07-07:00
by fmw42
see viewtopic.php?f=4&t=21269 for details of the IM changes for sRGB and RGB and grayscale