[Bug 309352] [NEW] Krita writes incorrect PNG files

[cologic]

Public bug reported:

Binary package hint: krita

Steps to reproduce:

(1) Install krita and pngcheck:

||/ Name                                              Version                                           Description
+++-=================================================-=================================================-==================================================================================================================
ii  dcraw                                             8.80-1                                            decode raw digital camera images
ii  koffice-data                                      1:1.6.3-6ubuntu3                                  common shared data for the KDE Office Suite
ii  koffice-libs                                      1:1.6.3-6ubuntu3                                  common libraries and binaries for the KDE Office Suite
ii  krita                                             1:1.6.3-6ubuntu3                                  a pixel-based image manipulation program for the KDE Office Suite
ii  krita-data                                        1:1.6.3-6ubuntu3                                  data files for Krita painting program
ii  latex-xft-fonts                                   0.1-8                                             Xft-compatible versions of some LaTeX fonts
ii  libruby1.8                                        1.8.7.72-1ubuntu0.1                               Libraries necessary to run Ruby 1.8
ii  pngcheck                                          2.0.0-1.1                                         PNG file format checker
ii  ruby                                              4.2                                               An interpreter of object-oriented scripting language Ruby
ii  ruby1.8                                           1.8.7.72-1ubuntu0.1                               Interpreter of object-oriented scripting language Ruby 1.8

(2) Open Krita.
(3) Select Grayscale -> "White Background, 640x480".
(4) Click "Use this template".
(5) Save unmodified (or modified - but triggering this behaviour doesn't depend on modifying the image) the newly created image to a PNG file. I tried both the "Fast" and "Small" ends of the compression level setting and both produce PNGs ill-formed according to png-check.

(6) Run pngcheck -v on the resulting image (this output is from the 'fast' image, not the one attached to this bug):
File: test.png (2396 bytes)
  chunk IHDR at offset 0x0000c, length 13
    640 x 480 image, 8-bit grayscale, non-interlaced
  chunk sRGB at offset 0x00025, length 1
    rendering intent = absolute colorimetric
  chunk iCCP at offset 0x00032, length 216:  not allowed with sRGB

Expected results: a correct PNG file. What happened instead: an
apparently (although it's possible pngcheck is wrong, it gives a
detailed reason for its diagnosis) incorrect PNG file.

** Affects: koffice (Ubuntu)
     Importance: Undecided
         Status: New

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Krita writes incorrect PNG files
https://bugs.launchpad.net/bugs/309352
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