ZERO NOISE PHOTOGRAPHY

  • 39 Replies
  • 7009 Views
*

Offline PS

  • ***
  • 157
  • A610 1.00f
  • Publish
    ZERO NOISE PHOTOGRAPHY
    « on: 09 / January / 2008, 22:09:56 »
    Advertisements
    Zero Noise
    « Last Edit: 23 / January / 2010, 16:38:45 by PS »

  • Publish
    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 »

    *

    Offline Aged

    • *
    • 39
  • Publish
    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.

  • Publish
    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?


    *

    Offline PS

    • ***
    • 157
    • A610 1.00f
  • Publish
    .
    « Reply #4 on: 11 / January / 2008, 12:35:47 »
    .
    « Last Edit: 23 / January / 2010, 16:10:29 by PS »

  • Publish
    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 »

    *

    Offline Aged

    • *
    • 39
  • Publish
    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?

  • Publish
    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. 


    *

    Offline Aged

    • *
    • 39
  • Publish
    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.

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

     

    Related Topics