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Old Nov 7, 2006, 4:09 PM   #1
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Hi,

Maybe the experienced users already know this but
I am still posting it for their inputs and for other newbies
to exchange notes.

I shot the following two pictures of almost the same
scene (not too much of a scene ... just was fiddling
around with the camera)

1.
ISO 320
F 4.9
S 1/6
Focal Length 35mm
WB Auto
Flash Off





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Old Nov 7, 2006, 4:10 PM   #2
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(I apologize for not being able to post 2 images in the same post)

And here is the second image:

2.
ISO 400
F 4.9
S 1/6
Focal Length 35mm
WB Manual (Set with Reference WB on E 500)
Flash Off
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Old Nov 7, 2006, 4:16 PM   #3
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Now,

The image with Reference WB although has a higher ISO but
still is exhibiting less Noise.

Well I don't think there is too much difference between ISO 320
and ISO 400 and can be considered equal.

But the WB seems to be making a difference in the noise.

Is this a generality, can we always use the Reference WB to
achieve optimal noise or this is just happening in this one particular
instance ?

And also the Blue and White dots near the "P" ... are they Hot
Pixels ? When I magnify it enough I see Blue and White squares.
If they are hot Pixels then will Pixel Mapping sort this out or should
I go for a replacement (The camera is just one month old) ?

Cheers,
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Old Nov 8, 2006, 11:49 AM   #4
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Eeekss ... just saw it on a the monitor at work.

Sorry about that.

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Old Nov 8, 2006, 4:31 PM   #5
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my input would be, first shot is underexposed the second is closer to a correct exposure whenever you under expose you will get more noise, even more in the shadows. you want to "expose to the right" of the histrogram this will greatly reduce noise at any iso, just be careful not to blow the highlights.
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Old Nov 12, 2006, 8:16 AM   #6
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gaggu
im not sure the first shot is all that well focussed
what do you think

Riley
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Old Nov 12, 2006, 9:35 AM   #7
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-Rriley
Well ... yes ... there was blur.Both shots were handheld
at 1/6. There was blur in the first one.

And the difference in noise appeared to be significant on
my laptop because I had fiddled with the Gamma settings
on the grapic card as well as the brightness.
(I read alot on the laptop and write code as well so I had
done that to reduce glare)

The result was that whenever I used to open up DPReview
the last three dark shades of black appeared like one large
black strip. But somehow it never occured to me that fiddling
with gamma settings was the cause.

With those settings the images appeared to have a significant
difference in the noise as well as detail. The 2nd one appeared
to have less noise as well as less detail.

However, for the 2nd shot I had set up the Reference White
Balance. Thats what made me think that WB and noise were
related.

But I reset the graphic card to defaults and I can now see all
the shades of gray as well as it is easy to see that noise levels
are similar on both the shots.

The first one has blurring due to me not being able to hold
the camera steady



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Old Nov 12, 2006, 11:05 AM   #8
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The white spot seems to be on the lens cap and not on the photo, it looks that the two photos are not identical therfore I don't thinnk you have a pixel problem.
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