[Octave-bug-tracker] [bug #46872] imread not loading certain indexed png correctly

[Mike Miller]

Update of bug #46872 (project octave):

                 Summary: Incorrect loading of images => imread not loading
certain indexed png correctly

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Follow-up Comment #3:

Same here, and I can confirm that I can use "gm convert" to reformat the
provided image to a full-color image file, and then imread loads it
accurately.

Here is the output of "gm identify -verbose"


Image: problem_image_original.png
  Format: PNG (Portable Network Graphics)
  Geometry: 285x238
  Class: PseudoClass
  Type: palette
  Depth: 8 bits-per-pixel component
  Channel Depths:
    Red:      1 bits
    Green:    1 bits
    Blue:     8 bits
  Channel Statistics:
    Red:
      Minimum:                     0.00 (0.0000)
      Maximum:                 65535.00 (1.0000)
      Mean:                    25971.49 (0.3963)
      Standard Deviation:      32055.24 (0.4891)
    Green:
      Minimum:                     0.00 (0.0000)
      Maximum:                     0.00 (0.0000)
      Mean:                        0.00 (0.0000)
      Standard Deviation:          0.00 (0.0000)
    Blue:
      Minimum:                     0.00 (0.0000)
      Maximum:                 65535.00 (1.0000)
      Mean:                    20123.00 (0.3071)
      Standard Deviation:      16567.25 (0.2528)
  Colors: 5
    0: (255,  0,  0)      red
    1: (  0,  0,128)      navy
    2: (  0,  0,255)      blue
    3: (  0,  0,  0)      black
    4: (255,255,255)      white
  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)
  Filesize: 1.1Ki
  Interlace: No
  Orientation: Unknown
  Background Color: #FEFEFE
  Border Color: #DFDFDF
  Matte Color: #BDBDBD
  Page geometry: 285x238+0+0
  Compose: Over
  Dispose: Undefined
  Iterations: 0
  Compression: Zip
  Png:IHDR.color-type-orig: 3
  Png:IHDR.bit-depth-orig: 4
  Date:create: 2016-01-08T12:57:34+05:00
  Date:modify: 2003-09-17T15:35:00+05:00
  Signature: 1991ee2b0e4f2f9ec5621aa95832eac73296ace27f66cd3308f34293efdb77f8
  Tainted: False
  User Time: 0.020u



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