NI can remove pattern noise as long as the pattern is not of a big size, it
is rather ok but not perfect in removing the pattern noise in 5D II. Banding
is another issue I think NI is not capable to do.
Just found another phenomenon, when I shot a dark frame at the same ISO and
shutter speed (ISO125, 1/8s) of the problem image. The dark frame came out
totally dark even I push it two stops so I can't use the dark frame
subtraction method to cancel the pattern.
The pattern noise only appear on the area that is not totally dark so it
doesn't like a hardware (circuit noise) problem, may be a firmware update
can really solve it?
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt"
> That's interesting. In reading the complaints about banding it was said
> that the noise removers (like NI) were fine for removing random noise
> but were totally ineffective for pattern noise. It seems that NI must
> have some special magic. :-)
>
> Chuck Norcutt
>
>
> Moose wrote:
>> C.H.Ling wrote:
>>> When you shot RAW and push the exposure to near 1 stop you will see it.
>>> Here is an example:
>>>
>>> http://www.accura.com.hk/temp/IMG_7622.CR2 (8MB)
>>>
>>
>> I can understand your frustration.
>>
>> I appreciate all the effort you have gone to to give me more reasons to
>> put off any rash purchase to replace my 5D. ;-)
>>
>> Still, it doesn't seem insurmountable. NeatImage does quite a nice job
>> of eliminating the banding noise.
>> <http://www.moosemystic.net/Gallery/Others/CHLing/PatternNoiseNI.htm>
>>
>> I think that without the roll-over to compare, no one would notice the
>> very subtle pattern left in the darkest areas at step one. A second
>> application really cleans it up, if necessary.
>>
>> With this image, there isn't a noticeable effect, at least to me, on
>> detail in the lighter areas. Where there is an effect, the NI layer may
>> simply be masked to only affect the dark areas.
>>
>> I think the noise gives a sense of detail in the darkest smoke, but I
>> think it's false. Upon close inspection, it seems to me that the first
>> step loses no actual subject detail at all, and the second step maybe a
>> tiny bit.
>>
>> A. Neat(Image) Moose
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