[krita] [Bug 406710] New: For HDR kra files, mergedimage.png and preview.png are in SDR and have wrong colors

[Tymond]

https://bugs.kde.org/show_bug.cgi?id=406710

            Bug ID: 406710
           Summary: For HDR kra files, mergedimage.png and preview.png are
                    in SDR and have wrong colors
           Product: krita
           Version: nightly build (please specify the git hash!)
          Platform: MS Windows
                OS: MS Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Color models
          Assignee: krita-bugs-n...@kde.org
          Reporter: tamtamy.tym...@gmail.com
  Target Milestone: ---

Created attachment 119530
  --> https://bugs.kde.org/attachment.cgi?id=119530&action=edit
Image preview test image

SUMMARY
When you save a HDR .kra file, next time you open Krita and look at Last
Documents, you see it all wrong. It's because it shows the content of
mergedimage.png or preview.png (not sure which), which is automatically
converted to SDR.



STEPS TO REPRODUCE
1. Make a new HDR image.
2. Save as .kra file.
3a. Open Krita, look at Last Documents on welcome screen.
3b. Open as an archive, extract mergedimage.png and preview.png. Open them in
Krita.


OBSERVED RESULT
Last Documents shows miniatures with wrong colors.
Both images are in SDR and have wrong colors. (Some colors get lost while
converting from float to integer.)


EXPECTED RESULT
Images in Last Documents are displayed correctly, in HDR.
mergedimage.png is in HDR or at least has float color space assigned, so the
colors won't be horribly wrong when displayed.


SOFTWARE/OS VERSIONS
Version: 4.2.0-pre-alpha (git fb08951)
Windows: 10
Qt Version: 5.12.2

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