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| p.1 #9 · what would be some of the theoretical ways to increase digital dynamic range? |
To me, HDR doesn't really increase dynamic range information, it just /maps/ information for a high dynamic range into an intensity space with less dynamic range. I'm talking about where the dynamic range actually *increases*, not getting around it by tone mapping.
Interesting interpretation you post here about HDR. On the surface, you are correct, but ultimately, it is the representation that we perceive isn't it? Arbus there needs to be a means to portray that representation to our eyes/brains. So th remapping is necessary given current limitations of print. Think about it, if your eye had infinite dynamic range with a brain infinite perception ability, in order to translate a high dynamic range real-world image, you would then need a media that would be able to produce the highest and lowest light level. Considering the brightest levels would include something like the sun, you know it will be impossible to reproduce. So ultimately to Actaully Increase dynamic range as you say, it is more about the media to present it to our eyes since there are many current and future HDR technical techniques that will capture the range of the image that can be combined into huge image dynamic range. The trick and limitation is to then present it as such. Print won't cut it as the brightest whites are limited by the intensity of the ambient light reflecting off the media. Thus to increase dynamic range presentation of an image over print, you would need and Active Display with plenty of resolution, fine pitch pixels, and fine high bit control of luminosity.
Ultimately I believe you would rapidly hit the dynamic range limitations of your eye which I don't believe is too much better than current Monitor technology and HDR image creation techniques. (Think about a monitor that is super bright that you would hardly be able to look at.) Think about being on a beach, laying back on a blanket and someone steps almost between you and the sun/sunny sky; you can't see their face of you look at the sky, and viss versa if you block some of the light so you can see their face- essentially you are Remapping tonality so that you can adjust your perception into a range for you to view the detail of interest.
So, now you are left with ways of expanding the humany eye/brains dynamic range.... Maybe it has to do with Stereo Active displays where essentially you could split the high and low, one for each eye. Each display would ideally be able to cover half of the eyes true dynamic range. (This assumes the pupils and optic nerves act independently from each other which I believe is the case You can do this now using two versions of the image that barely overlap in DR. The neuroscience part then would be how to untrained the the brain for normal Single-eye Dominance perception issues, but I do believe this is possible much like military pilots did /do with their HUD displays that blocked part of their vision but needs incorporation as one image to the brain between both eyes. An alternate to the stereo displays should you have one monitor with such dynamic range would be simply to creat the stereo visual split for each eye with passive glasses with clear on one side (pupil adjusts and can properly perceive the brights), and low pass filter (ie sunglasses) for the other pupil so that it opens to see the dark detail. Likely not as good as the dual stereo displays but cheaper :-).
For the science part, I think the research would be interesting to learn truly how much independent eye imagery could be integrated by the brain to expand (double) normal dynamic range possible at any different moment in normal natural scenery. Even if not double, the technology is already there using current display technology to create the stereo two images expanding the Instantaneous DR of a single pupil, and see how much detail is recognized simultaneously by the brain by proving the two (high and low luminosity) images respectively to each eye.