Wrong gamma of 32-bit float images in Control Points editor

[Bicyclops]

Hello

32-bit floating-point images (from RawTherapee) are overexposed in the Control Points editor. Maybe they have the wrong gamma applied, or the embedded ICC profile is not used?

If you open the source images in GIMP-2.10.4 you will see them correctly with the correct gamma. They are of course very dark, so maybe the CP Editor is trying to make them easier to view for the user through dynamic range compression and increasing exposure. If that's the case, then nice, but the large CP editor magnification box, the one that magnifies the few pixels you are hovering over when placing new CPs, still shows a completely black preview, as you can see in screenshot screenshot_20180806_081643.png.

Sample images and screenshots:
https://filebin.net/3cp8rzg4e1t84vk2

Please download these, as the link will expire 2 months from now.

Operating System: Linux 4.17.0-sabayon x86_64
Architecture: 64 bit
Free memory: 2246320 kiB

Hugin
Version: 2018.0.0.5abfb4de7961
Path to resources: /usr/share/hugin/xrc/
Path to data: /usr/share/hugin/data/
Hugins camera and lens database: /home/morgan/.hugindata/camlens.db
Multi-threading using C++11 std::thread and OpenMP
Monitor profile: B133HAN02.1 #1 2016-10-19 21-46 D6500 2.2 F-S XYZLUT+MTX

Libraries
wxWidgets: wxWidgets 3.0.4
wxWidgets Library (wxGTK port)
Version 3.0.4 (Unicode: wchar_t, debug level: 1),
compiled at Jun 14 2018 19:21:01

Runtime version of toolkit used is 2.24.
Compile-time GTK+ version is 2.24.31.

libpano13: 2.9.19
Boost: 1.65.0
Exiv2: 0.26
SQLite3: 3.23.1
Vigra: 1.11.0
LittleCMS2: 2.9

[Bicyclops (bugs-8)]

The curve setting in "Preferences > Control Points Editor > HDR and 16 Bit display" does affect the preview in the CP editor, however the magnifier (which appears when placing a control point) is always black on these 32-bit images, regardless which "HDR and 16 Bit display" curve setting I use.

[tmodes (tmodes)]

For float/double images there is the setting in the preferences. So this is not a bug.