Image Noise - Chicagoland Sportbikes
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post #1 of 21 (permalink) Old 05-28-2008, 10:04 AM Thread Starter
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Image Noise

Alright, I'm pretty much a noob to any type of photography stuff, I've always just used a point and shoot. I recently got my Nikon P80 which I thought would be a good bridge between a P&S and a DSLR. My photos seem to have some "noise" in them using the auto setting. I haven't really had a chance to play with the Manual mode yet, but what are some ways to reduce the image noise in my pictures. It's a 10mp camera, I have it set to 8mp currently, and Normal for the image comrpession (as opposed to Fine or Basic).

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post #2 of 21 (permalink) Old 05-28-2008, 10:06 AM
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Examples to dissect please?

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post #3 of 21 (permalink) Old 05-28-2008, 10:06 AM
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ISO setting?
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post #4 of 21 (permalink) Old 05-28-2008, 10:08 AM
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Lens?

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post #5 of 21 (permalink) Old 05-28-2008, 12:20 PM Thread Starter
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The lens is permanently attached, It's a nikkor lens is all it says. The ISO is adjusted automatically in auto mode, but it is possible to adjust it in manual mode. I will post some samples when I get home later tonight, I don't have any with me at work.

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post #6 of 21 (permalink) Old 05-28-2008, 12:27 PM
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That could be your problem right there. You may be trusting the auto mode too much, and pushing it to do things it can't handle, or isn't sure how to handle.

Every cameras logic is different. Reading the manual and understanding how it's choosing the settings it chooses in Auto mode might help you get the best images with the hardware you have.

In the end though, it's all about light. You need to make sure you have enough of it, and you need to make sure that the camera sensor is getting exposed to enough of it to get those crisp, noise free images.

Chances are Mort is right, it's the camera swinging the ISO setting up to compensate for low light. Also, not being a proper D-SLR with a *larger* sensor puts your camera at a noise disadvantage right off the bat.

The sensor having a smaller overall surface area means there is less of it to catch those photons and process them into color images. Less light means more noise. You should still be able to pull off some pretty good images though, just get more light in the camera!

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post #7 of 21 (permalink) Old 05-28-2008, 12:33 PM
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That is what sucks about buying new cameras. The first thing I learned in my first photography class from my teacher was "I don't know a thing about your cameras, you have to read your manuals by Friday"

Every camera is different.
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post #8 of 21 (permalink) Old 05-28-2008, 12:42 PM Thread Starter
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Yeah, I've started reading the manual, it's over 100 pages though. I'm hoping to have it finished within the week.

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post #9 of 21 (permalink) Old 05-28-2008, 01:28 PM Thread Starter
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Found a good explanation of ISO settings, will play with that. It says that as you increase your ISO, image noise goes up. I want to lower the noise, so I would want to decrease my ISO, which would mean I would need to increase the light to get the proper exposure?

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post #10 of 21 (permalink) Old 05-28-2008, 01:31 PM
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Quote:
Originally Posted by Pinto Bean View Post
Found a good explanation of ISO settings, will play with that. It says that as you increase your ISO, image noise goes up. I want to lower the noise, so I would want to decrease my ISO, which would mean I would need to increase the light to get the proper exposure?
http://www.amazon.com/Understanding-.../dp/0817463003

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post #11 of 21 (permalink) Old 05-28-2008, 09:07 PM Thread Starter
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Examples

Here's a few examples, Is there anywhere that I can upload full res pics? 800x600 probably is a little small to analyze.
Attached Images
File Type: jpg DSCN0005.JPG (135.9 KB, 17 views)
File Type: jpg DSCN0022.JPG (96.1 KB, 23 views)

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post #12 of 21 (permalink) Old 05-29-2008, 12:38 AM
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I'm not really seeing anything that stands out as ISO-based noise in these shots.

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post #13 of 21 (permalink) Old 05-29-2008, 06:55 AM
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Quote:
Originally Posted by BusaDave View Post
I'm not really seeing anything that stands out as ISO-based noise in these shots.
+1
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post #14 of 21 (permalink) Old 05-29-2008, 07:04 AM
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Agreed. "Noise" on digital cameras is typically random blue and red specs imposed in the image, when the sensor logic doesn't have enough information (light) to pick the correct color for a particular pixel.

I'd have to see larger images, but maybe your upset with the compression and/or built in sharpening.

Still, get a handle on the ISO and how the Auto-mode works on your camera, and see if you can find a free place to upload high rez photos so we can see what your upset with. Maybe you just need to work with "fine" quality JPGs and shut of or turn down sharpening to be happy.

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Last edited by Lonely Raven; 05-29-2008 at 07:25 AM.
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post #15 of 21 (permalink) Old 05-29-2008, 07:43 AM Thread Starter
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Quote:
Originally Posted by Lonely Raven View Post
Agreed. "Noise" on digital cameras is typically random blue and red specs imposed in the image, when the sensor logic doesn't have enough information (light) to pick the correct color for a particular pixel.

I'd have to see larger images, but maybe your upset with the compression and/or built in sharpening.

Still, get a handle on the ISO and how the Auto-mode works on your camera, and see if you can find a free place to upload high rez photos so we can see what your upset with. Maybe you just need to work with "fine" quality JPGs and shut of or turn down sharpening to be happy.
Ahh, I see. I think I may set the camera to "fine" and see what results I get. I was upset with a sort of "fuzziness" on alot of the pictures. I'll find somewhere to upload high res pics.

The biggest comlpaint about this camera is that the pictures are too soft, so alot of people actually turn the sharpening up on this camera, but I haven't seen that yet.

I think a lot of the shots that I notice my "issue" in are taken in the rooms of my house that my parents painted orange, maybe it's from the weird orangish light that is present in those rooms?

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post #16 of 21 (permalink) Old 05-29-2008, 07:58 AM
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The camera seems to be having some problems with color balance. Too warm shots (red) from incandescent is not really unusual. Cameras try to detect something white in the picture to compensate for light temperature. Are you using the on-camera flash or just room light?

You should definately be using JPEG fine unless you need the memory space. I pretty much always shoot JPEG fine large, unless I rarely choose to shoot raw mode. A large amount of compression will definately affect your quality.

I think I increased the sharpening slightly but I pretty much use Photoshop to edit shots and do any sharpening and color correction there.

Dave
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post #17 of 21 (permalink) Old 05-29-2008, 08:07 AM
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When you are taking shots of people inside, turn the scene mode dial to "portrait mode". Here is what I am talking about:

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post #18 of 21 (permalink) Old 05-29-2008, 08:15 AM
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Damn we're good...we'll learn CLSB to shoot pitchers in no time!

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post #19 of 21 (permalink) Old 05-29-2008, 12:05 PM
 
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And the reason some cameras perform better at different ISO's is usually linked to the sensor size/type. If you look at Nikons top SLR right now which is the D3, then it will deliver excellent quality pictures at high ISO's.

Now noise also wasn't always a bad thing. In fact many times current digital photographers seek out that old school noise that film cameras produced which was more random and nicer than what we get in some cheaper digitals today.

If noise is an issue for you like it would be for someone like Mort82 or myself who prefer not to use flash (many others I'm guessing as well), then I suggest going to DPReview.com and find the camera review database. They will have ISO test shots to show you noise levels that you can compare with other cameras and pick the best one if that's your thing. For the person who has no problems with turning the flash on once it gets a little dark, noise shouldn't be an issue.
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post #20 of 21 (permalink) Old 05-29-2008, 01:17 PM Thread Starter
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Even at Large-Fine, my 4GB card holds 700+ images which is way more than I would ever want on a single card anyway. Everytime I use the camera, I usually transfer to my PC the next day.

I will try some of your suggestions and see if I get better results...Cubs Game tonight and tomorrow afternoon will make for some good practice.

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post #21 of 21 (permalink) Old 05-29-2008, 01:53 PM
 
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Quote:
Originally Posted by Lonely Raven View Post
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