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Author Topic: Dynamic range limitations due to glare and flare  (Read 18650 times)

Iliah

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Re: Dynamic range limitations due to glare and flare
« Reply #40 on: July 21, 2015, 03:46:01 pm »

the DR can be either greater or equal or smaller... noise can only reduce DR as recorded in raw data vs the original scene, no ? is there a situation when noise can increase the DR ?
No, if DR is determined by the presence of the levels in the histogram, noise actualy creates an illusion of wider dynamic range.
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Bart_van_der_Wolf

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Re: Dynamic range limitations due to glare and flare
« Reply #41 on: July 21, 2015, 05:06:30 pm »

2008 GoogleTech video of a talk by John McCann

https://youtu.be/ALfiTDYLtAQ

1 log unit is 3.3 EV.

and

http://mccannimaging.com/HDR/HDR_Papers.html

Part of the discussion looks like a Déjà vu to me.

Cheers,
Bart

P.S. the moved links in my original reaction are now: here, and here, and are also in the link to McCan's homepage that Iliah provided.
« Last Edit: July 21, 2015, 05:20:08 pm by BartvanderWolf »
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== If you do what you did, you'll get what you got. ==

Iliah

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Re: Dynamic range limitations due to glare and flare
« Reply #42 on: July 21, 2015, 05:16:33 pm »

> Part of the discussion looks like a Déjà vu

True, but there is hope that bis repetita placent.
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AlterEgo

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Re: Dynamic range limitations due to glare and flare
« Reply #43 on: July 21, 2015, 06:04:52 pm »

No, if DR is determined by the presence of the levels in the histogram, noise actualy creates an illusion of wider dynamic range.
but if we can see the details (S/N > "1") then it is not an illusion though, no matter how unuseful those details are...  so with FRV screenshot, I added +8 EV of simulated exposure and I still see the details, so it is not an illusion, no ?
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Iliah

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Re: Dynamic range limitations due to glare and flare
« Reply #44 on: July 21, 2015, 06:09:03 pm »

but if we can see the details (S/N > "1") then it is not an illusion though, no matter how unuseful those details are...  so with FRV screenshot, I added +8 EV of simulated exposure and I still see the details, so it is not an illusion, no ?
Illusions can be useful, but the topic is the scene reproduction, in a fairly accurate manner. You can add +12 to a single shot from a noisy sensor and there will be "details".
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