HDRI (或者HDR) 即High dynamic rage image (高動態範圍影像的縮寫)。HDRI是在相同的場景中結合幾張不同曝光值(EV)的影像，以捕捉真實環境光源為目標，把所有的景物之明暗細節都能記錄在一張影像資訊當中。

而HDRI有許多的應用，其中在3D場景中做為光源效果貼圖，用它來產生材質上的反射和折射環境背影，使虛擬模型有現實生活環境的照明數據；也就是說，一張HDRI圖檔影像就可以對虛擬模型上有真實感的照明。如果是幾張不同曝光值的普通格式影像，對虛擬模型所產生的照明效果，那和一張HDRI影像所產生的效果有什麼相似之處，興起了本研究的比對與測試。

在本研究的測試比對之中可以看出，HDRI當作3D光源貼圖時，它的影像品質會對虛擬物體照明有不同明暗對比的差別。

High dynamic range image (HDRI or HDR) is a set of techniques that integrates images with different Exposure Value (EV) to represent the same scene. The intention of HDRI is to capture the lighting in real scenes, as a consequence of which HDRI is able to record all the details of the real scene in one image information, such as light and darkness.

Moreover, HDRI has been applied to 3D scene to function as lighting maps. HDRI is able to produce the reflection of materials and refraction of background. Therefore, HDRI enables virtual models to be analogous with the illumination data of the real scenes. In other words, one HDRI image can nearly represent real lighting effect on virtual models. The aim of this study is to investigate the differences between the lighting effects represented by several images with different Exposure Value (EV) and the lighting effects represented by HDRI image on virtual model.

The finding of this study indicates that the chiaroscuro of virtual lighting objects is influenced by the quality of 3D mapped lighting image while HDRI is functioning as mapped lighting effects on 3D scene.

[1] B. J. Stearn., “Designing a Pipeline for Product Designers Using Image Based Illumination and High Dynamic Range Imagery to More Effectively Add Computer Generated Product Visualizations Into Live Action Photographs”, MFA Industrial, Interior and Visual Communication Design, The Ohio State University (2003).
[2] P. Debevec., “Rendering synthetic objects into real scenes: Bridging traditional and image-based graphics with global illumination and high dynamic range photography”. Paper presented at the Proceedings of the 25th annual conference on computer graphics and interactive techniques
(1998).
[3] P. Debevec, T. Hawkins, C. Tchou, H.-P. Duiker, W. Sarokin, and M. Sagar., “Acquiring the reflectance field of a human face”. In SIGGRAPH '00: Proceedings of the 27th annual conference on Computer graphics and interactive techniques (New York, NY, USA, 2000), ACM Press/Addison-Wesley Publishing Co., pp. 3-10 (2000).
[4] P. Debevec.. “Image-based lighting”. Computer Graphics and Applications, IEEE, 22(2) (2002).
[5] Edition, S . “Digital Lighting and Rendering”(2ed pa.),New Riders, Berkeley (2006).
[6] 王以斌，「MAYA8.X 材質與演算精」(初板)，
碁峯資訊股份公司，台北 (2007)。
[7] 蔡景河，「攝影新潮流HDR- 高動態範圍攝影」，
中國攝影家，2008年，第12期 (2008)。
[8] DSLR Raw 檔案聖經 (2009)，
http://www.flag.com.tw/page_2005/edm/994/994-2.htm
[9] Fxguide - VFX knowledge - Art of HDR (2009)，
http://fxguide.com/article268.html
[10] GRAB C4D論壇- 何謂HDRI (2009)，
http://www.grabc4d.org/redirect.php?tid=3006&goto=newpost
[11] HDRI Workflow with Maya and Photoshop (2009)，
http://www.digitaltutors.com/store/product.php?
productid=3470&cat=41&page=2
[12] High Dynamic Range Image Encodings (2009)，
http://www.anyhere.com/gward/hdrenc/hdr_encodings.html
[13] Recovering High Dynamic Range Radiance Maps from Photographs (2009)，
http://www.debevec.org/Research/HDR/
[14] Reflection Mapping History (2009)，
http://www.debevec.org/ReflectionMapping/
[15] Rthdribl (2009)，http://www.daionet.gr.jp/~masa/rthdribl/
[16] Ryeod's Blog- 天蠍幻思- HDRI文件格式簡介 (2009)，
http://longyunyao2006.blog.163.com/blog/static/1831512200692075647488/
[17] The Getty - Gustave Le Gray, Photographer (2009)，
http://www.getty.edu/art/exhibitions/le_gray/
[18] Wikipedia - High dynamic range imaging (2009)，
http://en.wikipedia.org/wiki/HDRI
[19] Wikipedia - High dynamic range imaging (2009)，
http://en.wikipedia.org/wiki/High_dynamic_range_imaging
[20] Wikipedia - Image based lighting (2009)，
http://en.wikipedia.org/wiki/Image_based_lighting
[21] Wikipedia - Paul Debevec (2009)，
http://en.wikipedia.org/wiki/Paul_Debevec
[22] Wikipedia - RGBE image format (2009)，
http://en.wikipedia.org/wiki/RGBE_image_format
[23] 火星時代社區- HDRI檔格式簡介 (2009)，http://bbs.hxsd.com/blog.php?b=11561
[24] 電插頭CG Info討論區- 實驗用max相機來拍HDRI照片 (2009)，
http://www.eplug-cg.com/city/Forum2/HTML/000287.html
[25] 電插頭CG Info討論區- HDR的問題 (2009)，
http://www.eplug-cg.com/city/Forum2/HTML/000312.html
[26] 電插頭CG Info討論區- HDR的問題 (2009)，
http://www.eplug-cg.com/city/Forum2/HTML/000312-2.html
[27] 維基百科 - RAW (2009)，
http://zh.wikipedia.org/w/index.php?title=RAW&variant=zh-tw
[28] 維基百科 - 高動態範圍成像 (2009)，
http://zh.wikipedia.org/w/index.php?title=%E9%AB%98%E5%8A%A8%E6%80%81%E8%
8C%83%E5%9B%B4%E6%88%90%E5%83%8F&variant=zh-tw