Is there any professional photographer in mylot?
May 11, 2008 1:22pm CST
What is the term "NOISE" means in photography? Is there any thing one can do to reduce the noise of the photo one had taken? How can we take noise free photographs?
• United States
12 May 08
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.
1 person likes this
12 May 08
Hi Thank you very much Here I have a doubt. If I have downloaded a programme you have mentioned, shall I reduce the noise from the photograph just like using photoshop to enhance the quality of photos? Please clarify.
• United States
13 May 08
I'm not sure what you want me to clarify.. but i'll try my best.. you can use photoshop to enhance the quality of your photos and use it to remove the noise. BUT you don't need to download photoshop to remove the noise. There are free programs like http://www.imagenomic.com/download_nwsa.aspx the bottom one that says Noiseware Community Edition Standalone 2.6 is FREE thats what I use to remove noise from my photos sometimes.. I have paint shop pro now tho and use that sometimes too.
21 May 09
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.