Noise after long exposure

Hi all,

I own a Canon 300D and last week I tried some night photographing in the city(which turned out great). No problem so far.

But yesterday I took some photos during daylight and these where all filled with noise! It seems like strokes of colored noise is on every photo. Also shadow are pixelated. On the link below I have a sample of a photo I took (RAW):

http://www.swind.nl/plant.jpg

What can I do to make this noise go away? Can somebody help me?

tia,

Sander


--
swind

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swind skrev:
Hi all,

I own a Canon 300D and last week I tried some night photographing in the city(which turned out great). No problem so far.

But yesterday I took some photos during daylight and these where all filled with noise! It seems like strokes of colored noise is on every photo. Also shadow are pixelated. On the link below I have a sample of a photo I took (RAW):

http://www.swind.nl/plant.jpg

What can I do to make this noise go away? Can somebody help me?

tia,

Sander


Underexposure or too high iso

--
Med venlig hilsen, Ole Larsen.
New Images And Design 2005-11-17
http://home.tiscali.dk/muggler

swind wrote:
I own a Canon 300D and last week I tried some night photographing in the city(which turned out great). No
problem so far.

But yesterday I took some photos during daylight and these where all filled with noise! It seems like strokes of
colored noise is on every photo. Also shadow are pixelated. On the link below I have a sample of a photo I took
(RAW):

http://www.swind.nl/plant.jpg

What can I do to make this noise go away? Can somebody help me?

You left the camera set to ISO 1600.

--
Ray Fischer

"John A. Stovall" wrote in message
...
On Sat, 31 Dec 2005 11:28:49 +0100, swind
wrote:


Hi all,

I own a Canon 300D and last week I tried some night photographing in the
city(which turned out great). No problem so far.

But yesterday I took some photos during daylight and these where all
filled with noise! It seems like strokes of colored noise is on every
photo. Also shadow are pixelated. On the link below I have a sample of a
photo I took (RAW):

http://www.swind.nl/plant.jpg

How can it be a RAW when it's a jpeg?


It's becoming fashionable to convert RAW files into jpg's...........(wise
people use Silkypix for that very purpose - but that's another story)

In message ,
(Ray Fischer) wrote:

You left the camera set to ISO 1600.

Even if it were, you'd only see banding in a low-contrast shot like this
if the image were under-exposed.

Banding occurs at low ISOs, as well, if the image is under-exposed.
--


John P Sheehy

John A. Stovall wrote:
PSD is a better format for converting RAW into than a jpeg.

Depends on what you are going to do with the file after converting it.
If you are
going to edit then clearly PSD is what you would want to convert to.
But if you
are going to print right from the converted image then jpeg could be
the way to
go. When I make prints I up load my files to Costco and have them
print them,
The PSD file will give me not better print then what I get from a jpg
copy.

The image that the OP posted the noise was clear enough that a psd file
would not have added much. The raw file would have been more useful
since the noise in the final image depends a lot of the settings during
the conversion, but not everyone has high speed internet. The exif
data what is really needed, but that data is missing from the photo.

Scott

John A. Stovall wrote:

Oh, I never print from a jpg but directly from CS2 with 16bit images
in ProPhoto color space. Why would you want to reduce your color
gamut to 8bits?

I just guess we have different standards of quality in our work.

I only bother with 16 bit if I'm going to apply curves or other
adjustments. Then I change to 8 bit jpeg & archive the raw file.

On Sat, 31 Dec 2005 11:28:49 +0100, swind
wrote:


Hi all,

I own a Canon 300D and last week I tried some night photographing in the city(which turned out great). No problem so far.

But yesterday I took some photos during daylight and these where all filled with noise! It seems like strokes of colored noise is on every photo. Also shadow are pixelated. On the link below I have a sample of a photo I took (RAW):

http://www.swind.nl/plant.jpg

What can I do to make this noise go away? Can somebody help me?

tia,

Sander

You can do few things:
1. Make sure your ISO settings are not being randomly chosen by the
camera. Use ISOs below 400.
2. Make sure the exposure is correct, and that the image doesn't have
large areas of underexpsure. In other words, expose for the darker
areas to bring out shadow detail without of course exposing so much
that lighter areas get "burned out."
3. Use a good noise reduction program like "Neat Image" and
experiment with it to determine what gets rid of any noise without
sacrificing image detail and tonality.
4. Use JPEG in-camera if you want to reduce noise in-camera as
cameras incorporate some level of noise reduction in JPEG modes.
However, this reduces dynamic range.
5. Use as fast a lens opening as possible to avoid any long
exposures. Exposures longer than 1 second generate electronic noise.

John A. Stovall wrote:

Oh, I never print from a jpg but directly from CS2 with 16bit images
in ProPhoto color space. Why would you want to reduce your color
gamut to 8bits?

I just guess we have different standards of quality in our work.

You would never see the difference between a print made from 8 bit/
color and 16/color.
If you are going to adjust the photo then 16 bits makes sense otherwise
you are not
getting any extra quality in your prints from the 16 bit.

BTW 8 bits does not reduce the color gamut, it just changes the
granularity.

Scott