Is there any professional photographer in mylot?

Well, I don't think i'm a professional although i get offers from people that want to me pay me to take their photo.

So i guess i'm dencent. lol anyway, noise is the digital equivalent of film grain basically. You can get it from using High ISO or long exposures. different camera and models will be different when it comes to how much noise is seen.

compact digital cameras are more prone to noise than digital SLRs cameras because of the size difference in the sensors.

you can get programs to get rid of the noise. there are some free ones and then there are the ones you have to pay for... in less you have something like photoshop that has stuff like that built into the program already.

:] Hello...

In photography, noise usually refers to an effect that looks somehwat like the "snow" when you hit a wrong channel on the tv--picture that spliced over a photo, giving it a grainy, snowy effect. In digital photography it usually is the result of a picture with a low resolution being made larger than it was inteded--blowing up a picture. It also can result from a non-optimal shutterspeed: lighting ratio (meaning the shutterspeed was not fast enough/too fast for however light or dark the subject is lit). In film photography, noise can come from many other areas as it needs to go through many more processes before it becomes a photo; a negative being blown up often causes noise, a picture that has been taken with non-optimal settings/flash usually will have the grainy noise as a result. In general, noise is a bad thing. However, sometimes photographers will ADD noise to photos in programs like photoshop for artistic effect. as well as adding, yes you can also remove noise in photoshop--it might now work perfectly, but it's better than nothing.:]

hope i helped!

Noise has been described well by the other contributers, but to add to the discussion: what we are talking about is a poor "signal to noise ratio". As you might guess, the term came into electronics from the audio recording/amplification industry, and was then adopted by photography.

Think about what happens when you turn up the volume on a sound system; at first, you just get louder sound, which makes it easier to hear. But then the sound starts to get distorted until it reaches the point where more volume ("gain") makes it harder to make out the sound you want to hear (the "signal").

In photography, the increasing the gain is achieved by increasing the sensor sensitivity (the ISO setting). Turn up the ISO above about 400 on most compact cameras and the signal to noise ratio becomes poor, the picture breaks up and you get ugly speckles. Digital SLRs can handle much higher ISO settings (and therefore can be used in poorer light conditions. There are 2 reasons for this: the sensor is larger, allowing more spa ce between the sensor sites; and each sensor site is larger, and can therefore collect more light.

The main cause of signal loss is heat. Packing more pixels onto a sensor generates more heat interference between the individual sites, so more pixels does not necessarily lead to better pictures. Compacts above about 7 megapixels start to push the limits (CMOS and Foveon sensors work better), and the limit at present for standard SLRs is somewhere about 15 megapixels. Full frame DSLRs work fine even at 24Mp.

If you images are already noisy, you cannot remove the noise, but by softening and selectively blurring parts of the picture can improve them greatly. Noise Ninja and similar programs do this very well, and the tools built into programs like PaintShopPro and Photoshop have become very sophisticated, too. But there are limits, so t is better to try and avoid the problem in the first place.