High Dynamic Range Rendering in VISH

The VISH visualization environment allows to create high dynamic range snapshots of an OpenGL scene rendered by hardware. Files are saved in EXR format and can be tone-mapped to 8 bit standard images such as jpeg by tools such as Photoshop.

Example of 8bit images created from rendered HDR images
Dataset is a galaxy cluster provided by the University of Innsbruck, courtesy © Wolfgang Kapferer 1999

Linear Mapping from HDR image to jpg (0.4MB)

Exposure-corrected tone mapping from HDR image to jpg (0.14MB)

Available file formats
Snapshot-gas-T0740.exr (3.1MB) Original HDR screenshot file
Snapshot-gas-T0740.png (1.8MB) PNG version of HDR rendering (including alpha-channel)
Snapshot-gas-T0740.tiff (2MB) 16bit tiff file created from original HDR source

Variations of Exposure during Rendering
These files are provided to demonstrate that initial rendering brightness does not affect the final image significantly. Snapshots that are over- or underexposed can be postprocess to still provide the entire range of color tones, even though their linear mapping to 8-bit colors looks ugly. We provide the original HDR files for interested parties to experiment themselves.
InitialExposed.exr Initial exposure with default settings.
OverExposed.exr Adjustment of rendering parameters to yield over-exposure
UnderExposed.exr Adjustment of rendering parameters to yield under-exposure

High-Resolution HDR Imaging

[Jpeg Image 6279x6279 Pixel] 2.4MB
[EXR HDR Image 6279x6279 Pixel] 8.2MB

High-Resolution HDR Velocity 8192x8192 Pixel

GalaxyVectorGlow8192x8192.exr] 143MB

Vectorfield Visualization on 16 Million Particles

Petashare Location of Full 3D Dataset
(200 timesteps)

[280GB Uncompressed] [210GB Compressed]

The files are provided in Fiberbundle HDF5 format.