Lecture 106:
High Dynamic Range Images & Panoramic Images | “Introduction to Masking”
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Lecture Recording:
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Previous Lectures:
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- Please note: the very end of the Spring 2016 - Evening lecture was cut off due to a recording error.
- Please note: Lecture 107 & Lecture 108 have been combined this semester (Spring 2016) to be one lecture. The new lecture number is 106. Previous lecture links are listed below.
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- Lecture 108 - Panoramic Photography (Spiring 2015) *Not available due to error in recording
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To view the lecture slides or to download a .pdf of the lecture, click one of the links below.
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
- 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/
- Any wide angle view or representation of a space 360 panorama = full 360 degree field of view
- 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
- Unrolled image (shown later in lecture)
- QTVR movie (an interactive movie where the viewer can choose where to look)
- 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:
- Photoshop 1.8 [HDR Images]
- Photoshop 1.10 [masks on adjustment layers]
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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