HDR Photography for the digital dome (fulldome) for IMERSA 2013
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HDR Photography for the digital dome (fulldome) for IMERSA 2013

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  • When we shoot HDR we set our F stop and adjust the cameras speed to gather different light. Generally HDR is created with 3 to 7 images taken with various camera speeds to create greater luminance between the lightest and darkest areas of a photograph.The human eye can see in a range of approximately 10,000:1. In comparison, a good digital camera can capture a scene with about 1,000:1.
  • When I first started working in the fulldome environment, one of my biggest frustrations in the dome was the inevitable washing out of images. At IAIA, our 24′ digital dome currently has 6 – PLUS U7 projectors. Each of these projectors has 3500 ANSI with a contract ratio of 2000:1. Add this low contrast ratio to the photon splash that occurs in a spherical theater and images that look gorgeous on a monitor become lifeless on the dome. High Dynamic Range (HDR) techniques solve the problem.The reflectivity and resulting light cross-bounce of the dome is also a very large factor in the apparent contrast ratio. Projectors can range from 1,000:1 to 320,000:1. But with the photons bouncing you loose a lot of the details of the image. The % of reflectivity of the screen is a big factor.
  • Note that any time you turn off the camera, you will have to reset the brackets on this camera.
  • Minuses – No batch process what so ever. I could not even get the Mac automator to do it.Can see what effect each preset is
  • • 360º image: Checking this option eliminates the seam betweenthe left and right sides of a panorama viewed in a 360º panoramicviewer. The seam would otherwise show because Details Enhancertakes into accoun• 360º image: Checking this option eliminates the seam betweenthe left and right sides of a panorama viewed in a 360º panoramicviewer. The seam would otherwise show because Details Enhancertakes into account local contrast, assigning different tonal valuesto the right and left parts of the image. The default value isunchecked. Note that this option is not enabled when the imageis in portrait mode, as the option is intended for panoramast local contrast, assigning different tonal valuesto the right and left parts of the image. The default value isunchecked. Note that this option is not enabled when the imageis in portrait mode, as the option is intended for panoramas.
  • Where else to find information:Help – type in keywords or see if there is a users manual
  • The more you check, the more files you will get.For successful batch you cant have extra photos in your selection or file directory

HDR Photography for the digital dome (fulldome) for IMERSA 2013 HDR Photography for the digital dome (fulldome) for IMERSA 2013 Presentation Transcript

  • By Ethan Bach www.ethanbach.comethan@ethanbach.com
  • What is HDR? Set of techniques to create images that see how the human eye sees. From 1,000:1 contrast to 10:000:1 Photo from Google search (www.dailyhdr.com) For more examples
  • Why HDR in the Dome? Light Scattering
  • Light Scatter on CurvedSurface Photo from www.sciencedirect.com
  • The HDR difference
  • Shooting using Canon 600D1. Make sure your camera is set to M (manual) on the dial on top of the camera2. Click the menu button and use the navigation buttons to the right of the LCD to move around.3. Go to the first tab over and choose Quality RAW4. move the bracket cursor to Quality then press “set”5. use navigation buttons to choose RAW and push “set”6. Move the main tabs in the menu to the second tab from the left.7. Go to Exposure comp. and push “set”8. Use the “main dial” next to the shutter button to set the expose bracketing to 29. you may play with this later to choose .5, 1, 1.5, or 2 stops
  • HDR in Photoshop1. Open Photoshop2. Go to File> Automate > Merge to HDR Pro3. Click Browse to load first set of photos4. Once the HDR window opens, click presets and choose from any of the options5. Adjust to you liking and click “OK”
  • HDR in Photomatix1. Open Photomatix2. Click “Load Bracketed Photos” and load first set of photos3. Set Preprocessing settings 1. If movement choose “Selective Deghosting” tool. If not do automatic.4. Click “Preprocess”
  • 5. Choose a preset on the right window and adjust on the left window.6. If you like your setting, you can save.7. Click Process
  • What’s the 360°Image Button for? Who can tell me? Try clicking it Where else can you find information? What if that doesn’t work?
  • How to Batch in Photomatix1. Go to Automate > Batch Bracketed Photos2. Under Process find your saved settings3. Check align images if any movement is suspected4. Select source Files or Folder5. Customize location and make a new folder6. Click Run
  • The Future of HDR HDR Video Processing using computer generated high and low exposure A Versatile HDR Video Production System