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ZERO NOISE PHOTOGRAPHY

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Offline PS

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ZERO NOISE PHOTOGRAPHY
« on: 09 / January / 2008, 22:09:56 »
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Zero Noise
« Last Edit: 23 / January / 2010, 16:38:45 by PS »
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Offline llinkawa

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #1 on: 10 / January / 2008, 10:58:37 »
Ignore dynamic range
shoot 9 fine jpg files (Canon defined as Super fine) by customized drive mode can be do it

Or you may use AllBest's Build auto bracketing / bracketing script for M mode could be take 3 or more pictures to solve it too

The following is by use normal photo averaging technique with 9 jpg files

So in landscape cases with a tripod, raw images is much unusable then jpg

100% crop


original resized image
« Last Edit: 10 / January / 2008, 11:17:56 by llinkawa »
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Offline Aged

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #2 on: 10 / January / 2008, 14:49:23 »
Hi
Another method is illustrated at http://jtrujillo.net/qpix/ using two RAW images overlaid into a 16 bit image.
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Offline cedricb

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #3 on: 11 / January / 2008, 03:24:27 »
PS: have you test the "TECHNIQUE OF THE 4 F-STOPS" with a CHDK script and do the post RAW processing on your computer?
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Offline PS

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« Reply #4 on: 11 / January / 2008, 12:35:47 »
.
« Last Edit: 23 / January / 2010, 16:10:29 by PS »
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Offline llinkawa

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #5 on: 11 / January / 2008, 18:31:37 »
Just a simple averaging method in Photoshop
Somehow between 8bit jpeg & 10bit/12bit raw image just 2-4 bit difference

When jpg versus raw, raw needs approx. 3 times more of storage volume then jpeg
That means while simply I take 3 jpeg images with 1EV bracketing method, it's dynamic range is totally over 1 shot of raw.
So is raw images really useful? I think it's depends on situation.

Another sample I test in office while my boss isn't here (see below).
PS: My boss is an equipment follower, so she think that usually takes raw + jpg images is the best method, but I think she's an idiot!
Because the company is selling photos...  :'(

1 shot of ISO800 jpg

9 shots of ISO800 jpg with +-4EV

100% crop of averaged jpg
« Last Edit: 11 / January / 2008, 18:57:52 by llinkawa »
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Offline Aged

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #6 on: 12 / January / 2008, 15:38:52 »
Just a mad? idea.
Take a correctly exposed raw image.
Make n copies to give n+1 images.
Sum the n images. Is this result over exposed by n stops?
Have you now Raw images at 1Ev and n*EV to overlay and process how you wish?
Where is the flaw in the argument?
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Offline ke7doy

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #7 on: 12 / January / 2008, 17:47:41 »
The flaw, it seems, might be that all of the copies will have identical noise and averageing them cannot cancel it. 
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Offline Aged

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #8 on: 14 / January / 2008, 05:54:08 »
Additional thoughts on "Mad" idea.
The analogue light values which fall on the sensor are converted into digital RAW.
Imagine four points on the sensor and see what happens when n=4. Anv= analogue value, Dv= digital value
   
  Anv        Dv 1x     Dv 2x      Dv 3x     Dv 4x    Mad4
  1/3           0             0              1            1             0
  1              1             2              3            4             4
  4/3           1             2              4            5             4
  7/4           1             3              3            7             4
   
It appears, provisionally, that (with the chosen) low light values the 4x exposure translates to four digital levels with a varying step size while the "Mad" idea translates only to two levels with a step size of 4.  I think "Mad" has died.
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Offline llinkawa

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Re: ZERO NOISE PHOTOGRAPHY
« Reply #9 on: 14 / January / 2008, 09:49:02 »
YupYup
"Mad would be" while photos are not shot by self
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