Kim Zhu
Visual Effects
9/7/10
Case Study Outline
HDRI, otherwise known as high definition range imaging, is essentially a technique that’s used to digitally capture and edit a dynamic range of light in an image, ranging anywhere from the lightest to the darkest areas of an image. As a result, HDR images are able to more accurately represent the complex range of lights that might be found in a real world scene such as direct sunlight to subtle starlight. The basic concepts and ideas behind HDR imaging has been around since the 1850s however, with the advancement of technology, the uses of HDR imaging have expanded beyond convention means. The uses of HDR imaging have evolved to the point where it’s become a valuable asset in the CG entertainment industry.
1. The concept of HDR imaging existed as early 1850s
a. Over the years with the advancement of technology, HDR based imaging grew to be more and more complex.
b. In 2005, Photoshop CS2 introduced a “Merge to HDR function” and thus fueled the desire for HDRI images
2. The concept behind HDRI involves multiple photos of one scene all shot at different f stops (or exposures).
a. A series of photos would be shot over exposed by 2 stops again and again, each time increasing the over exposure by 2 stop so that certain aspects of the photos would retain its detail. Then, the scene would be shot again, however this time the scene would be shot underexposed by 2 stops. This would be done so that although the scene might nearly black, the lights in the scene could be shot without being blown out.
b. Panorama shots are also commonly used in HDRI since with a panorama shot of your scene, you’re able to get all different types of light affecting that scene.
3. HDR images start being applied in the CG industry, primarily to replicate real world lighting situations.
a. HDR images are now commonly used in 3D environments and 3D models to mimic what that CG object might look like in a real world situation. As a result, characters and models become seamlessly integrated into live action footage, thus blurring what looks real and what looks artificial.
b. Introduction of HDRV or High definition range video cameras. HDR video isn’t a new concept, the some of the early HDR videos were done by stitching a series of HDR photos together to make a video. This would fall under the same vein as creating a stop motion animation. Aaron Patterson has an example of such videos http://www.petapixel.com/2010/04/02/hdr-time-lapse-video-by-aaron-patterson/
i. Now, what’s been done is, someone has managed to get HDR video using two Canon 5D Mark II cameras and a beam splitter so each camera was recording the same scene, just one was recording at an unexposed f-stop while the other was overexposed.
c. http://www.petapixel.com/2010/09/09/hdr-video-demonstration-made-with-two-canon-5d-mark-iis/
d. HDR is now abailable in iPhones, and the soon to be Nintendo 3DS. http://kotaku.com/5636332/the-3ds-is-looking-powerful/gallery/
e.
4. HDRI, a technique that was initially used to create dynamic images, has been integrated into the production pipeline of the entertainment industry. It uses in the CG industry have provided artists to replicate lighting in real world situation thereby creating world that feel seamlessly integrated into our own. Furthermore, technology has advanced HDRI technology to the point where its now possible to shot HDR videos.
http://i.gizmodo.com/5168454/how-to-create-stunningly-realistic-high-dynamic-range-photographs
Tuesday, September 14, 2010
Tuesday, September 7, 2010
Outline
Kim Zhu
Visual Effects
9/7/10
Case Study Outline
HDRI, otherwise known as high definition range imaging, is essentially a technique that’s used to digitally capture and edit a dynamic range of light in an image, ranging anywhere from the lightest to the darkest areas of an image. As a result, HDR images are able to more accurately represent the complex range of lights that might be found in a real world scene such as direct sunlight to subtle starlight. The basic concepts and ideas behind HDR imaging has been around since the 1850s however, with the advancement of technology, the uses of HDR imaging have expanded beyond convention means. The uses of HDR imaging have evolved to the point where it’s become a valuable asset in the CG entertainment industry.
1. The concept of HDR imaging existed as early 1850s
a. Over the years with the advancement of technology, HDR based imaging grew to be more and more complex.
b. In 2005, Photoshop CS2 introduced a “Merge to HDR function” and thus fueled the desire for HDRI images
2. The concept behind HDRI involves multiple photos of one scene all shot at different f stops (or exposures).
a. A series of photos would be shot over exposed by 2 stops again and again, each time increasing the over exposure by 2 stop so that certain aspects of the photos would retain its detail. Then, the scene would be shot again, however this time the scene would be shot underexposed by 2 stops. This would be done so that although the scene might nearly black, the lights in the scene could be shot without being blown out.
3. HDR images start being applied in the CG industry, primarily to replicate real world lighting situations.
a. HDR images are now commonly used in 3D environments and 3D models to mimic what that CG object might look like in a real world situation. As a result, characters and models become seamlessly integrated into live action footage, thus blurring what looks real and what looks artificial.
b. Introduction of HDRV or High definition range video cameras
4. HDRI, a technique that was initially used to create dynamic images, has been integrated into the production pipeline of the entertainment industry. It uses in the CG industry have provided artists to replicate lighting in real world situation thereby creating world that feel seamlessly integrated into our own. Furthermore, technology has advanced HDRI technology to the point where its now possible to shot HDR videos.
Visual Effects
9/7/10
Case Study Outline
HDRI, otherwise known as high definition range imaging, is essentially a technique that’s used to digitally capture and edit a dynamic range of light in an image, ranging anywhere from the lightest to the darkest areas of an image. As a result, HDR images are able to more accurately represent the complex range of lights that might be found in a real world scene such as direct sunlight to subtle starlight. The basic concepts and ideas behind HDR imaging has been around since the 1850s however, with the advancement of technology, the uses of HDR imaging have expanded beyond convention means. The uses of HDR imaging have evolved to the point where it’s become a valuable asset in the CG entertainment industry.
1. The concept of HDR imaging existed as early 1850s
a. Over the years with the advancement of technology, HDR based imaging grew to be more and more complex.
b. In 2005, Photoshop CS2 introduced a “Merge to HDR function” and thus fueled the desire for HDRI images
2. The concept behind HDRI involves multiple photos of one scene all shot at different f stops (or exposures).
a. A series of photos would be shot over exposed by 2 stops again and again, each time increasing the over exposure by 2 stop so that certain aspects of the photos would retain its detail. Then, the scene would be shot again, however this time the scene would be shot underexposed by 2 stops. This would be done so that although the scene might nearly black, the lights in the scene could be shot without being blown out.
3. HDR images start being applied in the CG industry, primarily to replicate real world lighting situations.
a. HDR images are now commonly used in 3D environments and 3D models to mimic what that CG object might look like in a real world situation. As a result, characters and models become seamlessly integrated into live action footage, thus blurring what looks real and what looks artificial.
b. Introduction of HDRV or High definition range video cameras
4. HDRI, a technique that was initially used to create dynamic images, has been integrated into the production pipeline of the entertainment industry. It uses in the CG industry have provided artists to replicate lighting in real world situation thereby creating world that feel seamlessly integrated into our own. Furthermore, technology has advanced HDRI technology to the point where its now possible to shot HDR videos.
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