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High Dynamic Range Cave Photography Mike Bedford

High Dynamic Range Cave Photography Mike Bedford. British Cave Research Association Cave Technology Symposium 2011 9 th April 2011, Ashbourne, Derbyshire. A miracle of optical engineering?. Perhaps …. … but this is a better one. Comparing Dynamic Range.

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High Dynamic Range Cave Photography Mike Bedford

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  1. High Dynamic RangeCave PhotographyMike Bedford British Cave Research AssociationCave Technology Symposium 20119th April 2011, Ashbourne, Derbyshire

  2. A miracle of optical engineering? Perhaps …

  3. … but this is a better one.

  4. Comparing Dynamic Range Conclusion: Ordinary digital photography can’t properly capture some scenes or even compete with the human eye.

  5. Demonstrating the Problem

  6. A Solution +2EV 0EV -2EV

  7. The Process -Practically • Mount camera on Tripod (although software can correct for alignment errors) • Take multiple exposures of same scene • Typically +2EV, 0EV & -2EV • or +2EV, +1EV, 0EV, -1EV & -2EV • although more stops overexposure might be needed for caving use • Use aperture priority • Process in software to create HDR image

  8. Tone Mapping • HDR software generates an HDR image • Can be stored using file formats designed specially for HDR images • While Jpeg has dynamic range of 256 : 1.dds, .exr, .hdr etc. offer 64,000 : 1 or more • But an LCD monitor provides 1,000 : 1 max • Prints offer an even lower dynamic range • Tone mapping is required to view on an ordinary monitor or print • Provides scope for creativity

  9. Tone Mapping Example

  10. Tone Mapping Example

  11. Tone Mapping Example

  12. Tone Mapping Example

  13. A Sunset

  14. A Sunset

  15. A Sunset

  16. Architectural Interiors

  17. Architectural Interiors

  18. Architectural Interiors

  19. The Ultimate – Cave Entrances • One of the highest dynamic range scenes we’re likely to encounter • Inside looking out and outside looking in both present challenges • Probably need to overexpose bymore than 2EV

  20. Browgill Cavefrom the onsidelooking out

  21. Browgill Cavefrom the insidelooking out

  22. Browgill Cavefrom the insidelooking out

  23. Browgill Cave - from the outside looking in

  24. Browgill Cavefrom the outsidelooking out

  25. Roger Kirk Cave

  26. Las Cuevas deSanto Tomás, Cuba

  27. Thank you for ListeningAny Questions?

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