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 | |
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| 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 |
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 [Jpeg Image 6279x6279 Pixel] 2.4MB [EXR HDR Image 6279x6279 Pixel] 8.2MB |
| High-Resolution HDR Velocity 8192x8192 Pixel |
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| Vectorfield Visualization on 16 Million Particles |
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Petashare Location of Full 3D Dataset [280GB Uncompressed] [210GB Compressed] The files are provided in Fiberbundle HDF5 format. |