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How exactly does "Auto HDR" work?

OP Slash8915

30th June 2014, 11:45 PM   |  #1  
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I never use HDR when taking pics on my GS4, because frankly, it doesn't need it. But I saw a couple of pictures taken with the G3 in HDR that looked AMAZING. It makes me think I'll be using HDR quite a bit. My question is, how exactly does the phone know when to use HDR and when not to? Is it somewhat intelligent about when using it would make the picture better?
1st July 2014, 07:19 AM   |  #2  
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1st July 2014, 10:54 AM   |  #3  
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Quote:
Originally Posted by Slash8915

I never use HDR when taking pics on my GS4, because frankly, it doesn't need it. But I saw a couple of pictures taken with the G3 in HDR that looked AMAZING. It makes me think I'll be using HDR quite a bit. My question is, how exactly does the phone know when to use HDR and when not to? Is it somewhat intelligent about when using it would make the picture better?

Quote:
Originally Posted by dondavis007

Listening in.

HDR is used to brighten the dark surrounds of where the lens is pointing towards a bright area.
Without HDR if you took a shot of say looking out of a window the light meter inside the camera exposes the shot for what you see outside the window but unlike our eyes which manage to 'balance the lighting' of everything else inside (surrounding walls) this non HDR shot would make these walls black.
Now take the same shot with HDR and although the exposure is still focused on what you see outside everything else inside the building has it's light lifted, so giving you an effect similar to what your eyes actually see.
The better the camera and I do mean dedicated DSLR type the better the HDR effect.

So, how does it do it......
Well, unknown to you when you take that HDR shot out of the window the sensor immediately notices the lighting is extremely bright in certain areas of the shot. So, instead of exposing the shot to either inside which would result in what is seen out of the window being washed out is extreme brightness or exposing the shot to what is seen outside which results in everything inside being extremely dark, what the sensor now does is say "Hey, let me lift the dark areas and lower the bright areas and give you are more balanced shot"!
It does this by taking two very quick successive shots, one bright areas and one dark areas and then quickly combines the two together.
All you get to see is the final shot.

Some camera apps such as Camera 360 offer a dedicated HDR section where you can control more of the shot.
There is even dedicated standalone apps which concentrate on nothing but HDR.
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