Bad display of png16

[adammaj1]

ImageMagick version

6.9.11-60 Q16 x86_64 2021-01-25

Operating system

Linux

Operating system, version and so on

Ubuntu 22.04.1 LTS

Description

First thanks for IM

 convert --version
Version: ImageMagick 6.9.11-60 Q16 x86_64 2021-01-25 https://imagemagick.org
Copyright: (C) 1999-2021 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC Modules OpenMP(4.5) 
Delegates (built-in): bzlib djvu fftw fontconfig freetype heic jbig jng jp2 jpeg lcms lqr ltdl lzma openexr pangocairo png tiff webp wmf x xml zlib

There is no HDRI here so maybe HDRI is not properly configured.

identify -verbose ./PNG16gx.png
Image:
  Filename: ./PNG16gx.png
  Format: PNG (Portable Network Graphics)
  Mime type: image/png
  Class: DirectClass
  Geometry: 1000x1000+0+0
  Units: Undefined
  Colorspace: Gray
  Type: Grayscale
  Base type: Undefined
  Endianness: Undefined
  Depth: 16-bit
  Channel depth:
    gray: 16-bit
  Channel statistics:
    Pixels: 1000000
    Gray:
      min: 0  (0)
      max: 65282 (0.996139)
      mean: 31928.8 (0.487202)
      standard deviation: 18567.4 (0.28332)
      kurtosis: -1.18025
      skewness: 0.0159661
      entropy: 1
  Colors: 1000
  Histogram:
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    1000: (256,256,256) #010001000100 gray(0.390631%)
    1000: (257,257,257) #010101010101 gray(1)
    1000: (258,258,258) #010201020102 gray(0.393683%)
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    1000: (513,513,513) #020102010201 gray(0.782788%)
    1000: (514,514,514) #020202020202 gray(2)
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    1000: (770,770,770) #030203020302 gray(1.17494%)
    1000: (771,771,771) #030303030303 gray(3)
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    1000: (2050,2050,2050) #080208020802 gray(3.1281%)
    1000: (2051,2051,2051) #080308030803 gray(3.12963%)
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    1000: (9729,9729,9729) #260126012601 gray(14.8455%)
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    1000: (53250,53250,53250) #D002D002D002 gray(81.2543%)
    1000: (53251,53251,53251) #D003D003D003 gray(81.2558%)
    1000: (53504,53504,53504) #D100D100D100 gray(81.6419%)
    1000: (53505,53505,53505) #D101D101D101 gray(81.6434%)
    1000: (53506,53506,53506) #D102D102D102 gray(81.6449%)
    1000: (53507,53507,53507) #D103D103D103 gray(81.6464%)
    1000: (53760,53760,53760) #D200D200D200 gray(82.0325%)
    1000: (53761,53761,53761) #D201D201D201 gray(82.034%)
    1000: (53762,53762,53762) #D202D202D202 gray(82.0356%)
    1000: (53763,53763,53763) #D203D203D203 gray(82.0371%)
    1000: (54016,54016,54016) #D300D300D300 gray(82.4231%)
    1000: (54017,54017,54017) #D301D301D301 gray(82.4247%)
    1000: (54018,54018,54018) #D302D302D302 gray(82.4262%)
    1000: (54019,54019,54019) #D303D303D303 gray(82.4277%)
    1000: (54272,54272,54272) #D400D400D400 gray(82.8138%)
    1000: (54273,54273,54273) #D401D401D401 gray(82.8153%)
    1000: (54274,54274,54274) #D402D402D402 gray(82.8168%)
    1000: (54275,54275,54275) #D403D403D403 gray(82.8183%)
    1000: (54528,54528,54528) #D500D500D500 gray(83.2044%)
    1000: (54529,54529,54529) #D501D501D501 gray(83.2059%)
    1000: (54530,54530,54530) #D502D502D502 gray(83.2074%)
    1000: (54531,54531,54531) #D503D503D503 gray(83.209%)
    1000: (54784,54784,54784) #D600D600D600 gray(83.595%)
    1000: (54785,54785,54785) #D601D601D601 gray(83.5966%)
    1000: (54786,54786,54786) #D602D602D602 gray(83.5981%)
    1000: (54787,54787,54787) #D603D603D603 gray(83.5996%)
    1000: (55040,55040,55040) #D700D700D700 gray(83.9857%)
    1000: (55041,55041,55041) #D701D701D701 gray(83.9872%)
    1000: (55042,55042,55042) #D702D702D702 gray(83.9887%)
    1000: (55043,55043,55043) #D703D703D703 gray(83.9902%)
    1000: (55296,55296,55296) #D800D800D800 gray(84.3763%)
    1000: (55297,55297,55297) #D801D801D801 gray(84.3778%)
    1000: (55298,55298,55298) #D802D802D802 gray(84.3793%)
    1000: (55299,55299,55299) #D803D803D803 gray(84.3809%)
    1000: (55552,55552,55552) #D900D900D900 gray(84.7669%)
    1000: (55553,55553,55553) #D901D901D901 gray(84.7684%)
    1000: (55554,55554,55554) #D902D902D902 gray(84.77%)
    1000: (55555,55555,55555) #D903D903D903 gray(84.7715%)
    1000: (55808,55808,55808) #DA00DA00DA00 gray(85.1575%)
    1000: (55809,55809,55809) #DA01DA01DA01 gray(85.1591%)
    1000: (55810,55810,55810) #DA02DA02DA02 gray(85.1606%)
    1000: (55811,55811,55811) #DA03DA03DA03 gray(85.1621%)
    1000: (56064,56064,56064) #DB00DB00DB00 gray(85.5482%)
    1000: (56065,56065,56065) #DB01DB01DB01 gray(85.5497%)
    1000: (56066,56066,56066) #DB02DB02DB02 gray(85.5512%)
    1000: (56067,56067,56067) #DB03DB03DB03 gray(85.5528%)
    1000: (56320,56320,56320) #DC00DC00DC00 gray(85.9388%)
    1000: (56321,56321,56321) #DC01DC01DC01 gray(85.9403%)
    1000: (56322,56322,56322) #DC02DC02DC02 gray(85.9419%)
    1000: (56323,56323,56323) #DC03DC03DC03 gray(85.9434%)
    1000: (56576,56576,56576) #DD00DD00DD00 gray(86.3294%)
    1000: (56577,56577,56577) #DD01DD01DD01 gray(86.331%)
    1000: (56578,56578,56578) #DD02DD02DD02 gray(86.3325%)
    1000: (56579,56579,56579) #DD03DD03DD03 gray(86.334%)
    1000: (56832,56832,56832) #DE00DE00DE00 gray(86.7201%)
    1000: (56833,56833,56833) #DE01DE01DE01 gray(86.7216%)
    1000: (56834,56834,56834) #DE02DE02DE02 gray(86.7231%)
    1000: (56835,56835,56835) #DE03DE03DE03 gray(86.7247%)
    1000: (57088,57088,57088) #DF00DF00DF00 gray(87.1107%)
    1000: (57089,57089,57089) #DF01DF01DF01 gray(87.1122%)
    1000: (57090,57090,57090) #DF02DF02DF02 gray(87.1138%)
    1000: (57091,57091,57091) #DF03DF03DF03 gray(87.1153%)
    1000: (57344,57344,57344) #E000E000E000 gray(87.5013%)
    1000: (57345,57345,57345) #E001E001E001 gray(87.5029%)
    1000: (57346,57346,57346) #E002E002E002 gray(87.5044%)
    1000: (57347,57347,57347) #E003E003E003 gray(87.5059%)
    1000: (57600,57600,57600) #E100E100E100 gray(87.892%)
    1000: (57601,57601,57601) #E101E101E101 gray(87.8935%)
    1000: (57602,57602,57602) #E102E102E102 gray(87.895%)
    1000: (57603,57603,57603) #E103E103E103 gray(87.8965%)
    1000: (57856,57856,57856) #E200E200E200 gray(88.2826%)
    1000: (57857,57857,57857) #E201E201E201 gray(88.2841%)
    1000: (57858,57858,57858) #E202E202E202 gray(88.2856%)
    1000: (57859,57859,57859) #E203E203E203 gray(88.2872%)
    1000: (58112,58112,58112) #E300E300E300 gray(88.6732%)
    1000: (58113,58113,58113) #E301E301E301 gray(88.6748%)
    1000: (58114,58114,58114) #E302E302E302 gray(88.6763%)
    1000: (58115,58115,58115) #E303E303E303 gray(88.6778%)
    1000: (58368,58368,58368) #E400E400E400 gray(89.0639%)
    1000: (58369,58369,58369) #E401E401E401 gray(89.0654%)
    1000: (58370,58370,58370) #E402E402E402 gray(89.0669%)
    1000: (58371,58371,58371) #E403E403E403 gray(89.0684%)
    1000: (58624,58624,58624) #E500E500E500 gray(89.4545%)
    1000: (58625,58625,58625) #E501E501E501 gray(89.456%)
    1000: (58626,58626,58626) #E502E502E502 gray(89.4575%)
    1000: (58627,58627,58627) #E503E503E503 gray(89.4591%)
    1000: (58880,58880,58880) #E600E600E600 gray(89.8451%)
    1000: (58881,58881,58881) #E601E601E601 gray(89.8466%)
    1000: (58882,58882,58882) #E602E602E602 gray(89.8482%)
    1000: (58883,58883,58883) #E603E603E603 gray(89.8497%)
    1000: (59136,59136,59136) #E700E700E700 gray(90.2358%)
    1000: (59137,59137,59137) #E701E701E701 gray(90.2373%)
    1000: (59138,59138,59138) #E702E702E702 gray(90.2388%)
    1000: (59139,59139,59139) #E703E703E703 gray(90.2403%)
    1000: (59392,59392,59392) #E800E800E800 gray(90.6264%)
    1000: (59393,59393,59393) #E801E801E801 gray(90.6279%)
    1000: (59394,59394,59394) #E802E802E802 gray(90.6294%)
    1000: (59648,59648,59648) #E900E900E900 gray(91.017%)
    1000: (59649,59649,59649) #E901E901E901 gray(91.0185%)
    1000: (59650,59650,59650) #E902E902E902 gray(91.0201%)
    1000: (59904,59904,59904) #EA00EA00EA00 gray(91.4076%)
    1000: (59905,59905,59905) #EA01EA01EA01 gray(91.4092%)
    1000: (59906,59906,59906) #EA02EA02EA02 gray(91.4107%)
    1000: (60160,60160,60160) #EB00EB00EB00 gray(91.7983%)
    1000: (60161,60161,60161) #EB01EB01EB01 gray(91.7998%)
    1000: (60162,60162,60162) #EB02EB02EB02 gray(91.8013%)
    1000: (60416,60416,60416) #EC00EC00EC00 gray(92.1889%)
    1000: (60417,60417,60417) #EC01EC01EC01 gray(92.1904%)
    1000: (60418,60418,60418) #EC02EC02EC02 gray(92.192%)
    1000: (60672,60672,60672) #ED00ED00ED00 gray(92.5795%)
    1000: (60673,60673,60673) #ED01ED01ED01 gray(92.5811%)
    1000: (60674,60674,60674) #ED02ED02ED02 gray(92.5826%)
    1000: (60928,60928,60928) #EE00EE00EE00 gray(92.9702%)
    1000: (60929,60929,60929) #EE01EE01EE01 gray(92.9717%)
    1000: (60930,60930,60930) #EE02EE02EE02 gray(92.9732%)
    1000: (61184,61184,61184) #EF00EF00EF00 gray(93.3608%)
    1000: (61185,61185,61185) #EF01EF01EF01 gray(93.3623%)
    1000: (61186,61186,61186) #EF02EF02EF02 gray(93.3639%)
    1000: (61440,61440,61440) #F000F000F000 gray(93.7514%)
    1000: (61441,61441,61441) #F001F001F001 gray(93.753%)
    1000: (61442,61442,61442) #F002F002F002 gray(93.7545%)
    1000: (61696,61696,61696) #F100F100F100 gray(94.1421%)
    1000: (61697,61697,61697) #F101F101F101 gray(94.1436%)
    1000: (61698,61698,61698) #F102F102F102 gray(94.1451%)
    1000: (61952,61952,61952) #F200F200F200 gray(94.5327%)
    1000: (61953,61953,61953) #F201F201F201 gray(94.5342%)
    1000: (61954,61954,61954) #F202F202F202 gray(94.5357%)
    1000: (62208,62208,62208) #F300F300F300 gray(94.9233%)
    1000: (62209,62209,62209) #F301F301F301 gray(94.9248%)
    1000: (62210,62210,62210) #F302F302F302 gray(94.9264%)
    1000: (62464,62464,62464) #F400F400F400 gray(95.314%)
    1000: (62465,62465,62465) #F401F401F401 gray(95.3155%)
    1000: (62466,62466,62466) #F402F402F402 gray(95.317%)
    1000: (62720,62720,62720) #F500F500F500 gray(95.7046%)
    1000: (62721,62721,62721) #F501F501F501 gray(95.7061%)
    1000: (62722,62722,62722) #F502F502F502 gray(95.7076%)
    1000: (62976,62976,62976) #F600F600F600 gray(96.0952%)
    1000: (62977,62977,62977) #F601F601F601 gray(96.0967%)
    1000: (62978,62978,62978) #F602F602F602 gray(96.0983%)
    1000: (63232,63232,63232) #F700F700F700 gray(96.4858%)
    1000: (63233,63233,63233) #F701F701F701 gray(96.4874%)
    1000: (63234,63234,63234) #F702F702F702 gray(96.4889%)
    1000: (63488,63488,63488) #F800F800F800 gray(96.8765%)
    1000: (63489,63489,63489) #F801F801F801 gray(96.878%)
    1000: (63490,63490,63490) #F802F802F802 gray(96.8795%)
    1000: (63744,63744,63744) #F900F900F900 gray(97.2671%)
    1000: (63745,63745,63745) #F901F901F901 gray(97.2686%)
    1000: (63746,63746,63746) #F902F902F902 gray(97.2702%)
    1000: (64000,64000,64000) #FA00FA00FA00 gray(97.6577%)
    1000: (64001,64001,64001) #FA01FA01FA01 gray(97.6593%)
    1000: (64002,64002,64002) #FA02FA02FA02 gray(97.6608%)
    1000: (64256,64256,64256) #FB00FB00FB00 gray(98.0484%)
    1000: (64257,64257,64257) #FB01FB01FB01 gray(98.0499%)
    1000: (64258,64258,64258) #FB02FB02FB02 gray(98.0514%)
    1000: (64512,64512,64512) #FC00FC00FC00 gray(98.439%)
    1000: (64513,64513,64513) #FC01FC01FC01 gray(98.4405%)
    1000: (64514,64514,64514) #FC02FC02FC02 gray(98.4421%)
    1000: (64768,64768,64768) #FD00FD00FD00 gray(98.8296%)
    1000: (64769,64769,64769) #FD01FD01FD01 gray(98.8312%)
    1000: (64770,64770,64770) #FD02FD02FD02 gray(98.8327%)
    1000: (65024,65024,65024) #FE00FE00FE00 gray(99.2203%)
    1000: (65025,65025,65025) #FE01FE01FE01 gray(99.2218%)
    1000: (65026,65026,65026) #FE02FE02FE02 gray(99.2233%)
    1000: (65280,65280,65280) #FF00FF00FF00 gray(99.6109%)
    1000: (65281,65281,65281) #FF01FF01FF01 gray(99.6124%)
    1000: (65282,65282,65282) #FF02FF02FF02 gray(99.6139%)
  Rendering intent: Undefined
  Gamma: 0.454545
  Background color: gray(255)
  Border color: gray(223)
  Matte color: gray(189)
  Transparent color: gray(0)
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 1000x1000+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Zip
  Orientation: Undefined
  Properties:
    date:create: 2022-12-22T11:24:08+00:00
    date:modify: 2022-12-22T11:24:08+00:00
    png:IHDR.bit-depth-orig: 16
    png:IHDR.bit_depth: 16
    png:IHDR.color-type-orig: 0
    png:IHDR.color_type: 0 (Grayscale)
    png:IHDR.interlace_method: 0 (Not interlaced)
    png:IHDR.width,height: 1000, 1000
    signature: e6a56d8fc761af95782fbdc9f6240193804b8b96420aa777c23f4ffec8554368
  Artifacts:
    filename: ./PNG16gx.png
    verbose: true
  Tainted: False
  Filesize: 4097B
  Number pixels: 1000000
  Pixels per second: 100.844MB
  User time: 0.000u
  Elapsed time: 0:01.009
  Version: ImageMagick 6.9.11-60 Q16 x86_64 2021-01-25 https://imagemagick.org

Steps to Reproduce

I have 16 bit gray color file with simple horizontal gradient. It's dimension in pixels is1000x1000. It is created with libpng library

I can open it with IM viewer ( it has color depth q16hdri) and check

Channel depth:
    gray: 16-bit
  Channel statistics:
    Pixels: 1000000
    Gray:
      min: 0  (0)
      max: 65282 (0.996139)

I see 4 reptition of gradients in the image but IMHO it should be linear gradient, monotone, from 0 to 999)

 //set row data
    for (y = 0; y < yMax; ++y) {
        png_bytep row = row_pointers[y];
        for (x = 0; x < iMax; ++x) {
                uint16_t color = x;
                *row++ = (png_byte)(color & 0xFF);
                *row++ = (png_byte)(color >> 8);
        }
    }

I think that it is a bug : bad display of 16 bit color file
What do you think about it ?

Images

[Danack]

@adammaj1 If this is still an issue, can you provide an example source image?

[adammaj1]

@Danack Is this png file not the source image ?

[Danack]

I have 16 bit gray color file with simple horizontal gradient. It's dimension in pixels is1000x1000. It is created with libpng library

I see 4 reptition of gradients in the image

Yeah, that's what I see on github also.

If the image is showing as 4 repetitions of the gradient in both ImageMagick and on Github, then it's probably either a problem with libpng or the image generation code.

What do you expect the ImageMagick developers to do? btw did you produce that image yourself, from the code in the StackOverflow question?

[Danack]

I'm pretty sure the color calculation is just wrong....

Plugging in two example numbers, done by hand so there may be mistakes.

short color = 255;

*row++ = (png_byte)(color & 0xFF); // 255
*row++ = (png_byte)(color >> 8);   // 0

short color = 256;

*row++ = (png_byte)(color & 0xFF); // 0
*row++ = (png_byte)(color >> 8);   // 0

There should be scaling over the whole 16 bit range (which is (2^16) - 1, aka 65535) and also dividing by how many pixels there are in the image. It should be more like:

short color = 255;
uint16_t actual_color = (65535 * color) / 1000;

*row++ = (png_byte)((actual_color & 0xFF00) >> 8); // 0x41
*row++ = (png_byte)((actual_color & 0xFF)); // 0x47

short color = 256;
uint16_t actual_color = (65535 * color) / 1000;

*row++ = (png_byte)((actual_color & 0xFF00)  >> 8); // 0x41
*row++ = (png_byte)((actual_color & 0xFF)); 0x88

So I really doubt this is a bug in ImageMagick.

[adammaj1]

Here is an image made with your code

short color = x;
uint16_t actual_color = (65535 * color) / 1000;

*row++ = (png_byte)((actual_color & 0xFF00) >> 8); // 0x41
*row++ = (png_byte)((actual_color & 0xFF)); // 0x47

I have checked it with gimp
it has a color from 0 = black to ( hex) fcfcfc = (decimal) 16579836 = white

If this colors are out of 0-255 range how IM treats them ? ( the display is good now)

[adammaj1]

I have tried also create png16 in IM 6 using

convert gradient: -define png:color-type=0 -define png:bit-depth=16 -size 1000x1000 gray16.png

but it is now good command