Lecture 106:

High Dynamic Range Images & Panoramic Images | “Introduction to Masking”


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Lecture Notes for Lecture 106: High Dynamic Range Images & Panoramic Images

HDR Photography

High Dynamic Range

  • A set of techniques that allow a greater dynamic range of luminances between the lightest and darkest areas of an image
  • Image: http://www.oreillynet.com/

High Dynamic Range

  • A set of techniques that allow a greater dynamic range of luminances between the lightest and darkest areas of an image
  • Image: www.studioshadowlight.com

Why? (Artistic)

  • To more accurately represent the wide range of light intensity levels found in real scenes
  • To mimic how the human eye sees a scene (which cannot be captured in traditional photographs)
  • Image: www.jamie-katz.com

Why? (Rendering)

  • To provide background imagery for a rendering that adjusts to differing light conditions/camera exposures established in a rendered scene

Tone Mapping

  • Reduces overall contrast to facilitate display of HDR images on devices with lower dynamic range
  • Can be applied to produce images with preserved or exaggerated local contrast for artistic effect.
  • Image: www.illiteratewithdrawal.com

Tone Mapping (continued)

  • Reduces the dynamic range, or contrast ratio, of the entire image, while retaining localized contrast (between neighboring pixels)
  • Image: www.hdrsoft.com

Software Choices

  • Photoshop
    • Merge to HDR automated action
    • Post processing necessary to get desired results (curves, levels, masking,etc.)
    • No built in tone mapping Available on lab computers PC/Mac
  • Photomatix
    • Considered to be gold standard in HDR tone mapping
    • Plugins for Photoshop, Lightroom, Aperture or Standalone Application
    • $100-$200 (depending on version, but academic pricing (60% off) for students)
    • PC/Mac
    • Image: prolineimagery.blogspot.com
  • Essential HDR (community edition)
    • Great tone mapping Free to use
    • Limited size (resolution) of output unless you pay
    • PC only
    • Image: imagingluminary.com

Examples

  • PANORAMIC PHOTOGRAPHY
    • Any wide angle view or representation of a space 360 panorama = full 360 degree field of view
      PANORAMA?
    • Drawing by Stephen Wiltshire, http://www.stephenwiltshire.co.uk/
  • PANORAMIC PHOTOGRAPHY?
    • Involves stitching multiple images together to give a very wide angle (often 360 degree) view of a particular scene
  • Isolation of Nodal Point
    • This eliminates “parallax” in final stitched image.
    • “Move your body/camera around nodal point”
  • MECHANICS
  • MECHANICS (parallax)
  • FINAL RESULTS
  • SOFTWARE
  • PHOTOSHOP
    • Available in Lab
    • Can stitch small groups of images well
    • Automated process
    • Difficult to stitch a full panorama
    • Mac/PC
  • STITCHER (AUTODESK)
    • Easy In, Easy Out
    • Intuitive graphic interface for stitching
    • Expensive
    • Mac/PC
    • (last updated in 2009)
  • PT GUI
    • Manual or automated picking of control points for more accurate stitching
    • Built on PanoTools (open source)
    • $105 Mac/PC
  • HUGIN
    • Manual or automated picking of control points for more accurate stitching
    • Built on PanoTools (open source)
    • Processing images takes time Installed on Lab Computers! FREE!
    • Mac/PC
  • Photosphere (iOS/Android)
    • Available wherever you have your phone
    • Great for Outdoors (no close up objects)
    • Simple & Easy to use
    • Interior Panoramas are difficult
  • EXAMPLES
    • Tambo Colorado, Peru (Stitcher)
    • Tambo Colorado, Peru (Stitcher)
    • Sacsayhuamán, Peru (Stitcher)
    • Cuzco, Peru (PT Gui)
    • Moray, Peru (PT Gui)
    • Moray, Peru
    • Ollantaytambo, Peru (PT Gui)
    • Ollantaytambo, Peru (Stitcher)
    • Amtrak Train Station, Oakland, California (Stitcher)
    • Wurster Hall, UC Berkeley (PT Gui)
    • Wurster Hall, UC Berkeley (PT Gui)
    • Mactia Computer Lab, UC Berkeley (Stitcher)
    • ChabotSpace& ScienceCenter,Oakland,California(Stitcher)
    • Architecture Studio (Stitcher)
    • Brooklyn Bridge (shot by hand, PT Gui)Alameda Naval Air Station, Alameda, California (PT Gui)
    • Coral Coast, Fiji (Stitcher)
    • Highland Lake, Maine (PT Gui)
    • Dillon Beach, California (PT Gui)
    • Glen Alpine Creek (near Lake Tahoe, California) (Stitcher)
    • Mosquito Pass, Desolation Wilderness, California (PT Gui)
    • Mt.Tallac (near Lake Tahoe, California) (PT Gui)
    • Desolation Wilderness, California (PT Gui)
    • Grass Lake, Desolation Wilderness, California (PT Gui)
    • Angora Peak, Desolation Wilderness (Hugin)
    • San Francisco, California (Stitcher)
    • San Francisco International Airport (PT Gui)
    • San Francisco International Airport (PT Gui)
    • San Francisco International Airport (PT Gui)
    • San Francisco International Airport (PT Gui)
    • San Francisco International Airport (PT Gui)
    • San Francisco International Airport (PT Gui)
    • San Francisco International Airport (PT Gui)
    • Interconnectedness Diagram (Grant’s Thesis)
    • Construction of Spherical Panoramic Drawings (Grant’s Thesis)
    • Final Thesis Drawing

Links:

About the Author:

Grant Adams

Associate Professor of Architecture
Diablo Valley College

www.youtube.com/digitaltoolsforarch | @270Photos | www.lulu.com/spotlight/dtfa  |  www.vimeo.com/grantadams