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Thread: Iso800

  1. #1

    Default Iso800

    Dear all,
    I've always toyed with the idea of taking indoor shots without flash, especially for stage performances. But consumer digicams produce lots and lots of noise at ISO800. I tried using Quantum Mechanics (a software), rev it up to full power, and applied to an ISO800 image. Below is the result:

    Before


    After

    C700UZ, ISO800, 1/25s, F3.5

    What do you guys think of the result? I am pretty satisfied with it...it just looks like a film image taken with ISO800 film, complete with the grains. For more info on quantum mechanics,

    visit http://www.weekai.com, click on "information", then "dealing with noise"
    or visit http://www.camerabits.com
    Last edited by Tweek; 5th February 2002 at 10:23 PM.

  2. #2
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    Default Re: Iso800

    VERY GOOD!!
    Canon Lover :)

  3. #3

    Default

    could u post the 'before' pic too???

  4. #4

    Default

    looking at articles on noise reduction software, I'm wondering if what they have in common is that they are basically applying in PS terms, gaussian blurring to selective areas and then resharpening the image? Perhaps a test photo with lots of 'sharp objects' like signs with text etc will illustrate the effects...

  5. #5
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    Default

    The thing about digital noise is that it has a set frequency as a general rule, and hence is uniform. The best noise reduction programs out there analyse this undercurrent of noise and remove it, without taking out too much detail.

    Others do indeed apply standard functions selectively, and usually in LAB space to maximise image detail retention.

    Applying blur and so on will work, but will result in the obscuring of too much proper detail since it does not distinguish between image detail and image noise.

  6. #6
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    Default

    so which is a noise reduction algorithm....quantum mechanics or g-isoR for the G2?

  7. #7

    Default

    Mine at ISO400 very grainy liao

    Where can I find this Quantum Mechanics software?

    BTW, maybe u can post the original image too Tw?

    Thanks!

  8. #8

    Default

    I'm using the ones from Digitital Secrets.. pretty good, especially the new one. http://www.digitalsecrets.net

  9. #9

    Default

    The "before" photo is added to the first thread. Blitz, Quantum Mechanics can be found at http://www.camerabits.com

    Yeah, the one from Digital Secrets is pretty good, and it's free somemore...but I prefer Quantum Mechanics.

  10. #10

    Default

    eh... why in the 'before' pic, 1 of the table in the last row is black but in the 'after' pic it's white?

  11. #11
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    Default

    Originally posted by Goose
    eh... why in the 'before' pic, 1 of the table in the last row is black but in the 'after' pic it's white?
    wow! u got a golden eye sia! like that u also can see!

  12. #12

    Default

    Originally posted by mEc


    wow! u got a golden eye sia! like that u also can see!
    no lah....i was comparing the 2 pics closely to see how much noise was reduced mah. That's when i noticed the table colour diff.

  13. #13

    Default

    Originally posted by Goose
    eh... why in the 'before' pic, 1 of the table in the last row is black but in the 'after' pic it's white?
    oops...the black is because I filled the border with black colour, and the colour "spilled" onto the white of the table....haha, my mistake.

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