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Thread: digital image quality at 100% view = pixeltized/noise?

  1. #1

    Default digital image quality at 100% view = pixeltized/noise?

    Hi there, I'd been wondering why most of my indoor photos when view in 100%, it shows pixels / noise? eg. shots taken at ISO 400, 1/60s, f/4.0, P-mode, 300D + 420EX + 50mm f/1.8

    Is it normal or due to camera shake?

    The subject also don't look sharp at 100% view, unless zoom out to 50% then looks better in Photoshop CS. image size at 3072x2048. However, when print out to 4R, it's acceptable.

    Any idea?

    Thanks in advance.
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

  2. #2

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    Hi...

    maybe you would like to post a sample here... so that the experts in CS can give you some help...

    Any post processing done?

    me also newbie....

  3. #3

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    hi there, I was also thinking posting a sample just now.
    ok. its done.



    (iso 400, f/4.0, 1/60s, 50mm f/1.8, flash with 420ex.)
    100% crop from original 6 megapiexel picture.

    As you can see, the above suffer noise and also soft due to cam-shake?

    Any advise?

    Thanks all.
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

  4. #4
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    Default

    camera shake.

  5. #5

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    Quote Originally Posted by sehsuan
    camera shake.
    camera shake may not explain the noise and grain.

    4R looks Ok as the resolution needed for 4R is relatively low

    I'm wondering if your subject is too far away from the flash and the sample shot you posted above is actually rather dark but has been brightened a lot in photoshop?

  6. #6
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    goering, i would disagree with you. check out the "ghosting" of the *** logo towards the left side. i would say this photo was shot in a hurry, and wasn't taken when a proper positioning of the camera was achieved.

    noise is one thing, shake is another.

  7. #7

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    Hmm OK .. I suppose there is visible camera shake but I'm wondering why is the shirt so grainy?

  8. #8

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    Quote Originally Posted by sehsuan
    goering, i would disagree with you. check out the "ghosting" of the *** logo towards the left side. i would say this photo was shot in a hurry, and wasn't taken when a proper positioning of the camera was achieved.

    noise is one thing, shake is another.
    ya. I agreed. that shot was taken in a rush... while my daughter rushing me to go school

    1. I didn't expect at ISO400, the noise is quite obvious when view in 100%. The same shows on other ISO400 photos too.

    2. I did use the built-in flash on this... because my daughter was standing at the windows side, strong backlight, so my intention to pop-up for fill-flash, while in aperture priority mode. I also took a few shots in P-mode with built-in flash (iso400, f/4, 1/60s, EF 24mm f/2.8 prime). Same image quality.

    Agreed. Noise is one thing, while I admit my camera shake problem damn bad ... arrghh...
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

  9. #9
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    Hmmm, was the picture taken on JPEG?
    There seem to be some bits of pixelation. Could be due to your compression on the JPEG. Check your JPEG compression settings, Fine,Medium or Low.

  10. #10

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    Quote Originally Posted by Prismatic
    Hmmm, was the picture taken on JPEG?
    There seem to be some bits of pixelation. Could be due to your compression on the JPEG. Check your JPEG compression settings, Fine,Medium or Low.
    Hi Prismatic, nope. It was taken in RAW, then converted to jpeg at highest quality.
    In RAW, it already show such pixelation at ISO400.

    Could it be my 300D sensor need to send in for service?

    Thanks in advance.
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

  11. #11

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    Just a thought... was your daughter moving at that time... cos' the pixalation is pretty unacceptable from the 300D... I've used this camera before, and am quite confident of its capabilities...
    Jia Wang... "A photo is only as beautiful as the photographer's eyes can see."
    My Eyes ;)

  12. #12

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    Quote Originally Posted by Jia Wang
    Just a thought... was your daughter moving at that time... cos' the pixalation is pretty unacceptable from the 300D... I've used this camera before, and am quite confident of its capabilities...
    good question man!
    ya, it was hard to ask them keep still everytime I take picture with them.

    Does it answer pixelation?
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

  13. #13
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    Quote Originally Posted by ST_sg
    Hi Prismatic, nope. It was taken in RAW, then converted to jpeg at highest quality.
    In RAW, it already show such pixelation at ISO400.

    Could it be my 300D sensor need to send in for service?

    Thanks in advance.
    Other then the motion blur/handshake part. The pixelation seem highly unusual. Suggest you send it in for a check... and maybe check your lens for any dust or anything else.

  14. #14

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    Will do some more shots to double confirm the pixelation issue.

    Thanks all.
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

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