HDR Viewer

GUI which displays HDR images, no bullshit.

Features

• Opens popular HDR image formats: Radiance PIC (*.pic, *.hdr), PFM (*.pfm, *.ppm), OpenEXR (*.exr)
• Exports images in Radiance PIC, PFM or OpenEXR format
• Fast zoom, pan and brightness control
• Manage multiple image documents in tabs
• Compare opened images (absolute difference or side-by-side)
• Thumbnails in Windows shell

Build

Prerequisites

• C++ 17 compiler
• CMake
• Qt 6

Checkout

git clone https://github.com/Acly/hdrv.git hdrv

Configure and Build with CMake

Build from the command line using the typical CMake workflow.

mkdir build
cd build
cmake ..
cmake --build .

Windows - Visual Studio 2019

Open the folder in Visual Studio to configure and build using its CMake/Ninja integration.

If Qt6 is not found automatically you can add its location to the CMake command line with eg. -DCMAKE_PREFIX_PATH=C:\Qt\6.0.0\msvc2019_64.

After building, runtime libraries can be copied with windeployqt --qmldir viewer/view build/release/hdrv.exe.

Linux

If Qt6 is not found automatically you can add its location to the CMake command line with eg. -DCMAKE_PREFIX_PATH=$HOME/Qt/6.0.0/gcc_64.

Use

Load images by supplying them as arguments to the hdrv executable, drag-and-drop them into the viewer or use the Open image button in the tab bar.

Mouse controls

• [ Pan ] Hold the left mouse button to view different regions of the image if it does not fit on the screen.
• [ Zoom ] Use the mouse wheel to scale the image.
• [ Compare ] Hold the right mouse button in comparison mode to move the image comparison separator.

Keyboard shortcuts

• [ +/- ] Increase / decrease the image brightness.
• [ Left/Right ] Iterate through images in the current folder.
• [ 1/2/3/... ] Switch to image tab 1, 2, 3, ...
• [ S ] Toggle between the last two image tabs.
• [ C ] Open comparison mode for the last two images.
• [ R ] Reset positioning and scaling of the image.

Thumbnails

A thumbnail shell integration is present for Windows in the subproject thumbnails. On x86 Windows installations the project must be compiled as x86 target and vice versa for x64 Windows installations to be compatible.

You can use the buttons in the UI to (un)install the thumbnail handler. Note that you should not move/delete the thumbnails.dll without uninstalling it beforehand.

To register the extension manually use an elevated shell and type:

regsvr32 thumbnails.dll

Removing the extension works by adding /u to the command:

regsvr32 /u thumbnails.dll

TODO

• Show more stats (average / maximum / minimum color)
• More options for tone mapping