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Old Jan 18, 2011, 12:34 AM   #1
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Default Increasing Photo quality?

Hi there,
I have a Panasonic Lumix DMC-ZS3. I have problems with the photos. Very grainy. I've researched and have learned about sensor-size, etc.

I initially tried to improve the quality of the photos by DEcreasing the image size. My question is; is this supposed to work in theory?

I don't require the largest images. I just require sharp, good looking ones.

Will decreasing the image size help? Some other parameter?

Plz and thx,
Marco.
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Old Jan 18, 2011, 1:56 AM   #2
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overly "grainy" digital images are usually the result of noise, not image size, and decreasing image size will only give you smaller noisy photos. noise is usually most apparent at high ISO (sensitivity), especially with small, point-n-shoot sensors (Panasonic has battled noise problems for years; my old FZ20 had serious issues under all but ideal conditions at low ISO). if your camera has different ISO settings, pick the lowest one. that will slow your shutter speed down, but it should help with the noise.
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Old Jan 18, 2011, 5:11 AM   #3
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80 iso is "ok" at best. new camera time. canon s95.
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Old Jan 18, 2011, 1:42 PM   #4
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Downsizing will decrease noise by "averaging" adjacent pixels - averaging being one of the standard noise reduction techniques.

If you want to test that, shoot a photo of a uniformly and dimly lit monochrome surface (wall) at high ISO and long shutter speed. Downsize it and compare the histogram of the downsized image with the original. The "width" will be narrower in the downsized one. If the wall was truly monochrome and uniformly lit, the histogram would be a zero width spike (delta function) without noise.
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Old Jan 18, 2011, 9:58 PM   #5
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Quote:
Originally Posted by mcsilvio View Post
80 iso is "ok" at best. new camera time. canon s95.
yeah, Panasonic has struggled with noise issues for a long time... i loved the sharpness and clarity i got from my old FZ-20 but the noise was terrible...
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Old Jan 19, 2011, 3:53 AM   #6
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Quote:
Originally Posted by mcsilvio View Post
80 iso is "ok" at best. new camera time. canon s95.
I love my S95 and it's certainly got better IQ than the ZS3 but for small prints, I would call the ZS3 a lot more than "ok" at various ISO levels.

ZS3 album
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