[Cin] HDR still image trick

[Andrew Randrianasulu]

https://discourse.radiance-online.org/t/hdr-display-options/1081/2

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[...]

Various researchers have built their own systems by combining a DLP
projector with an LCD display with it's backlight "hinged" out of the way,
a la the original paper by Seetzen et al:

Seetzen, Helge, W. Heidrich, W. Stuezlinger, G. Ward, L. Whitehead, M.
Trentacoste, A. Ghosh, A. Vorozcovs, "High Dynamic Range Display Systems,"
ACM Trans. Graph. (special issue SIGGRAPH 2004), August 2004.

For my own use, I still have the HDR viewer I made over a decade ago:

Ward, Greg, "A Wide Field, High Dynamic Range, Stereographic Viewer,"
Proceedings of PICS 2002, April 2002.

By far the easiest (and cheapest) solution for still images is to print out
a grayscale version of the square root of your image (with maximum
normalized to 1.0) as described in the above paper, but as a large-format
print. I would make this one the image with exaggerated contrast, since you
can print it at high-resolution. Then, project the original image divided
by this grayscale image using a standard DLP or LCD projector -- preferably
a bright one although it doesn't need to be high-resolution, onto this
print. Line it up, and violá! You have a high-resolution, high dynamic
range still image. There's no way to make it move, sadly.

-Greg


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