Digital Camera Noise
I am a newbie to the site so please forgive my incompetence. Moving right along, is there a trick to removing digital camera noise in images, without totally blurring them ? For example, see the attached image. This is a detail from a digital photo of a sunset that I took recently. You can see the graininess of the noise in the image, and, well, it has that "nails-on-chalkboard" feeling to me. I can get rid of some of the noise if I resize the image to about 1/3 the size, of course, but I would like to know if there are better ways. Thanks.
Welcome Metabug, there are some commercial/shareware/freeware options to be found in this link to further links:
Some are Photoshop plugs for Mac or PC, some are PC apps and some are Photoshop 6 or higher actions, as well as tips and techniques on the subject.
Hope this helps,
Let me add my welcome, too.
Check out the free actions offered at this site. Among them is a good noise reducer...
Another alternative is the actions offered (for sale, not too expensive) at www.FredMiranda.com. I've not used these, but many people rave about their effectiveness.
Hope this helps...
Here's the quick, easy way to figure out what your settings need to be for a good photograph.
1. Figure out what the largest size you will want to make your image into (IE: 4x6, 5x7, 8x10, etc.)
2. Multiply each component of that size by 300 (optimal for prints is 300 ppi)
Say your choice is 5x7 - you'll multiply 5x300 (1500) and then multiply 7x300 (2100)
The res setting on your camera for a 5x7 print should be at least 1500x2100 ppi
1. Set your camera to the highest res setting (or the res setting you want to use)
2. Divide each component of that setting by 300
This will give you the largest optimal size print you can make from your camera at that res setting
IE: The res setting on your camera is 1500x2100 ppi
1500/300 = 5
2100/300 = 7
Your largest optimal print size for that camera at that res setting is 5x7
Jak: Sadly, this is the max resolution that my camera allows. This is a Kodak DC4800, 3.1 megapixel digital camera. Normally 3.1 mp is pretty good, but the camera has massive noise problems in low-light conditions. Do you have any DC4800-specific tips on how to reduce the noise in the original picture ?
I've just been looking over the specs on that camera HERE and have a couple of questions:
1. Are you using the compressed or uncompressed mode (TIFF or JPEG)?
2. Are you zooming?
3. What ISO setting are you using?
4. Have you changed the dimensions of your image from the original taken by the camera? The resolutions options for that camera (2160x1440) indicate that the largest optimal image is 5x7.
All/any of these things could affect your image quality.
I also just found this HERE:
(I did a Google search for "Kodak DC4800 noise")
The DC4800 offers a good range of exposure control, with aperture priority and full manual modes available, as well as the ability to set the ISO from 100 to 400 and select from spot, center weighted or multi-pattern metering. The camera does a truly exceptional job in low light shooting situations, as we were able to obtain useable images as low as 1/16 foot candles, or about 0.67 lux, with great detail (even at the 100 ISO setting!). Since we were using shutter speeds as slow as 16 seconds at these low light levels, there is some noise in the images, particularly at the 200 and 400 ISO settings. (We direct readers to Mike Chaney's excellent Qimage Pro program, for a tool with an amazing ability to remove image noise without significantly affecting detail.) Overall though, the DC4800's low-light shots showed some of the lowest noise and best color of any consumer-level digicam we've tested to date (July, 2000). To fully understand the DC4800's low light capabilities, note that an average city night scene under modern street lighting corresponds to a light level of about 1 foot candle. Thus, the DC4800's ability to produce clear images at 1/16 foot candles is an exceptional performance.
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