Is this noise, and why?

shogran

shogran

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560
Name
Josh
Edit My Images
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Hiya,

I am very new to DSLR photography and recently went on my first outing to take photos. I ended up in a cathedral nearby where I bought a permit to take photos for £1 and got snapping. All of the photos looked ok on my cameras LCD but on my PC at full resolution (4272x2848) they look like they have noise or some other kind of "fuzz" to them. I shot them on automatic mode only changing the exposure on a Canon EOS 450D Rebel Xsi. I have hosted the image on imageshack so you can see what I mean:



Can anyone offer any suggestions?
 
its a combination...shot at iso 800 on your camera will produce some noise.. you can use noise reduction software... but the shutter speed was 1/6 at 46mm this is too slow a shutter speed to get a good sharp image IMHO.. I would say it needs to be exposed more as well.
 
Exif of the above image ...

Camera Make: Canon
Camera Model: Canon EOS DIGITAL REBEL XSi
Image Date: 2009:12:30 14:18:21
Flash Used: No
Focal Length: 46.0mm
CCD Width: 22.30mm
Exposure Time: 0.167 s (1/6)
Aperture: f/5.0
ISO equiv: 800
Exposure Bias: -2.00
White Balance: Auto
Metering Mode: Matrix
Exposure: program (Auto)


I'd say remove the exposure bias, -2 stops is making the image dark and then you can lower the ISO. higher ISO settings can result in noise.
 
Trev Rich said:
Someones in for a big telling off me thinks.... 800 longest edge Scotthehat?
Click to expand...

Sorry have I done somthing wrong?

GarynLea said:
Exif of the above image ...

Camera Make: Canon
Camera Model: Canon EOS DIGITAL REBEL XSi
Image Date: 2009:12:30 14:18:21
Flash Used: No
Focal Length: 46.0mm
CCD Width: 22.30mm
Exposure Time: 0.167 s (1/6)
Aperture: f/5.0
ISO equiv: 800
Exposure Bias: -2.00
White Balance: Auto
Metering Mode: Matrix
Exposure: program (Auto)


I'd say remove the exposure bias, -2 stops is making the image dark and then you can lower the ISO. higher ISO settings can result in noise.
Click to expand...

I do remember taking the first few under exposed by accident. So if I use manual ISO settings it should improve?
 
shogran said:
Sorry have I done somthing wrong?



I do remember taking the first few under exposed by accident. So if I use manual ISO settings it should improve?
Click to expand...

propbably no need for manual ISO yet - although if you do keep it as low as possible, but most importantly you need to change the -2.0EV exposure bias to 0. Thats whty you're underexposeing at the moment, and an underexposed shot will normally have more noise then a properly exposed one
 
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