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Thread: Photo look grainy (noise)

  1. #1

    Default Photo look grainy (noise)

    I am using Canon Ixus Izoom 5mp, with DIGIT II
    http://www.dpreview.com/reviews/spec...canon_sd30.asp

    I used to shoot at 3mp but find that photo (day & night time) tend to look grainy on my pc. So i shoot at 5mp instead but still have those grains. Is that small camera cannot shoot clear photo because the lens is small? or is it setting problem? I tried manual and auto.

  2. #2

    Default Re: Photo look grainy (noise)

    or is it due to low light? this camera has a review of lower performance in low light condition. I set ISO to 50, 100 and 200.

  3. #3
    Member Buggy's Avatar
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    Default Re: Photo look grainy (noise)

    how grainy is it. maybe you can post the photo for us to evaluate.

  4. #4

    Default Re: Photo look grainy (noise)

    erm... are you viewing it at 100%? if so... unless the subject is very close... else it will always be "grainy" even at iso 50. This is mainly due to a small sensor.

    But if you view the full picture "compacted" size eg your monitor screen, or on a 4R. It should be ok

    if its still grainy went its "compacted" there may be some problems with the camera...
    P&S: Sony U20, Pana-leica FZ5, Canon S90, Pana DMC-T3
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  5. #5

    Default Re: Photo look grainy (noise)

    My monitor resolution is 1280 x 1024

    example photo below:
    http://tinypic.com/view.php?pic=855u8sh&s=1

  6. #6

    Default Re: Photo look grainy (noise)

    Ok, I just took a look at your pic.

    Some things to consider:

    1. You're using an "older" point-and-shoot cam with an older sensor technology.

    2. You shot it without flash, so your cam had to boost the ISO.

    Unfortunately, TinyPic removed the ISO information. Can you tell us what the ISO was from the original file?
    Alpha

  7. #7

    Default Re: Photo look grainy (noise)

    Above photo taken using manual mode. The EXIF reads:

    Make - Canon
    Model - Canon DIGITAL IXUS i zoom
    Orientation - Top left
    XResolution - 180
    YResolution - 180
    ResolutionUnit - Inch
    DateTime - 2007:11:23 18:52:59
    YCbCrPositioning - Centered
    ExifOffset - 196
    ExposureTime - 1/15 seconds
    FNumber - 3.20
    ExifVersion - 0220
    DateTimeOriginal - 2007:11:23 18:52:59
    DateTimeDigitized - 2007:11:23 18:52:59
    ComponentsConfiguration - YCbCr
    CompressedBitsPerPixel - 5 (bits/pixel)
    ShutterSpeedValue - 1/15 seconds
    ApertureValue - F 3.19
    ExposureBiasValue - 0.33
    MaxApertureValue - F 3.19
    MeteringMode - Multi-segment
    Flash - Not fired, compulsory flash mode
    FocalLength - 6.30 mm
    UserComment -
    FlashPixVersion - 0100
    ColorSpace - sRGB
    ExifImageWidth - 2592
    ExifImageHeight - 1944
    InteroperabilityOffset - 2206
    FocalPlaneXResolution - 11520.00
    FocalPlaneYResolution - 11571.43
    FocalPlaneResolutionUnit - Inch
    SensingMethod - One-chip color area sensor
    FileSource - DSC - Digital still camera
    CustomRendered - Normal process
    ExposureMode - Manual
    White Balance - Auto
    DigitalZoomRatio - 1.00 x
    SceneCaptureType - Standard

    Maker Note (Vendor): -
    Macro mode - Normal
    Self timer - 20/10 sec
    Quality - Superfine
    Flash mode - Not fired
    Sequence mode - Single or Timer
    Focus mode - Single
    Image size - Large
    Easy shooting mode - Manual
    Digital zoom - None
    Contrast - Normal
    Saturation - Normal
    Sharpness - Normal
    ISO Value - 200
    Metering mode - Evaluative
    Focus type - Auto
    AF point selected - Auto AF point selection
    Exposure mode - Easy shooting
    Focal length - 6300 - 14900 mm (1000 mm)
    Flash activity -
    Flash details -
    Focus mode 2 - Single
    White Balance - Auto
    Sequence number - 0
    Flash bias - 0.00 EV
    Subject Distance - 390
    Image Type - IMGIGITAL IXUS i zoom JPEG
    Firmware Version - Firmware Version 1.00
    Image Number - 1013509
    Owner Name -

    Thumbnail: -
    Compression - 6 (JPG)
    XResolution - 180
    YResolution - 180
    ResolutionUnit - Inch
    JpegIFOffset - 5108
    JpegIFByteCount - 5630
    Last edited by damienloh; 25th November 2007 at 03:32 PM.

  8. #8

    Default Re: Photo look grainy (noise)

    Quote Originally Posted by Rashkae View Post
    2. You shot it without flash, so your cam had to boost the ISO.
    The flash might make the background look darker. So sometimes I don't use flash. Or use "red-eye double flash". This Canon has a "slow synchro" flash which use a slow shutter speed too.

  9. #9

    Default Re: Photo look grainy (noise)

    Another sample photo using Indoor Scene Mode:
    http://tinypic.com/view.php?pic=6jnlbol&s=1

    EXIF info:

    Make - Canon
    Model - Canon DIGITAL IXUS i zoom
    Orientation - Top left
    XResolution - 180
    YResolution - 180
    ResolutionUnit - Inch
    DateTime - 2007:11:25 15:36:40
    YCbCrPositioning - Centered
    ExifOffset - 196
    ExposureTime - 1/13 seconds
    FNumber - 4.00
    ExifVersion - 0220
    DateTimeOriginal - 2007:11:25 15:36:40
    DateTimeDigitized - 2007:11:25 15:36:40
    ComponentsConfiguration - YCbCr
    CompressedBitsPerPixel - 5 (bits/pixel)
    ShutterSpeedValue - 1/13 seconds
    ApertureValue - F 4.00
    ExposureBiasValue - 0.00
    MaxApertureValue - F 4.00
    MeteringMode - Multi-segment
    Flash - Not fired, compulsory flash mode
    FocalLength - 9.06 mm
    UserComment -
    FlashPixVersion - 0100
    ColorSpace - sRGB
    ExifImageWidth - 2048
    ExifImageHeight - 1536
    InteroperabilityOffset - 2206
    FocalPlaneXResolution - 9102.22
    FocalPlaneYResolution - 9142.86
    FocalPlaneResolutionUnit - Inch
    SensingMethod - One-chip color area sensor
    FileSource - DSC - Digital still camera
    CustomRendered - Normal process
    ExposureMode - Auto
    White Balance - Auto
    DigitalZoomRatio - 1.00 x
    SceneCaptureType - Standard

    Maker Note (Vendor): -
    Macro mode - Normal
    Self timer - 20/10 sec
    Quality - Superfine
    Flash mode - Not fired
    Sequence mode - Single or Timer
    Focus mode - Single
    Image size - Large
    Easy shooting mode - Full Auto
    Digital zoom - None
    Contrast - Normal
    Saturation - Normal
    Sharpness - Normal
    ISO Value - Auto
    Metering mode - Evaluative
    Focus type - Auto
    AF point selected - Auto AF point selection
    Exposure mode - Easy shooting
    Focal length - 6300 - 14900 mm (1000 mm)
    Flash activity -
    Flash details -
    Focus mode 2 - Single
    White Balance - Auto
    Sequence number - 0
    Flash bias - 0.00 EV
    Subject Distance - 40
    Image Type - IMGIGITAL IXUS i zoom JPEG
    Firmware Version - Firmware Version 1.00
    Image Number - 1013655
    Owner Name -

    Thumbnail: -
    Compression - 6 (JPG)
    XResolution - 180
    YResolution - 180
    ResolutionUnit - Inch
    JpegIFOffset - 5108
    JpegIFByteCount - 5566
    Last edited by damienloh; 25th November 2007 at 03:33 PM.

  10. #10

    Default Re: Photo look grainy (noise)

    Hope you all can help me to determine is it my camera limitation, camera settings or other issues. Thanks. Wish to take good & *clear* photo.

  11. #11
    Moderator ortega's Avatar
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    Default Re: Photo look grainy (noise)

    to take the least noisy picture that your camera can take, you need to use the slowest ISO setting that you have.
    if exposure is too slow, use a tripod
    or you might want to try using flash and a slave flash ceiling bounce

  12. #12

    Default Re: Photo look grainy (noise)

    Hi, is slowest ISO mean lowest value 50?

  13. #13
    Member Buggy's Avatar
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    Default Re: Photo look grainy (noise)

    yes

    but in cases where it's not bright enough. u need slow shutter to compensate for the exposure.

  14. #14

    Default Re: Photo look grainy (noise)

    Thanks. Can someone look at above 2 photo and give comments?

  15. #15

    Default Re: Photo look grainy (noise)

    ISO 200 on that older Canon really is a bit grainy... This particular model "only" scores 3.61/5 on the dpreview image quality feedback from users, which is unusually low. The common consensus is that it's only good outdoors in bright daylight, and is bad indoors.
    Alpha

  16. #16

    Default Re: Photo look grainy (noise)

    hmm.. perhaps I should get a better camera? Saw my friend using Lumix and photo came out sharp & clear.

  17. #17

    Default Re: Photo look grainy (noise)

    Quote Originally Posted by damienloh View Post
    hmm.. perhaps I should get a better camera? Saw my friend using Lumix and photo came out sharp & clear.
    Lumix is also infamous for high ISO noise, except for perhaps the newest models.

    Since you're already familiar with the Canon interface, I suggest the new 860 IS. It's remarkably sharp, and the ISO noise control is good.
    Alpha

  18. #18
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    Default Re: Photo look grainy (noise)

    what about fuji with superccd? like f50 or something..

    btw just a ask.. so we are concluding that the noise (and thus the slight blurriness) is a limitation of the camera? =)

  19. #19

    Default Re: Photo look grainy (noise)

    Yes, it's camera limitation. The Fuji f50 is ok too, but less "stylish" i guess.
    Alpha

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