what is "noise" in a picture
Aug 22, 2011 21:01:42 #
samiam
Loc: Rochester, NY
I keep reading about the "noise" in pictures and ways to get around it. What exactly is "noise"
Aug 22, 2011 21:34:34 #
Noise makes a picture look "grainy". You get it from shooting at high ISOs. Shooting at a high ISO lets in more light. It makes your pictures very grainy, sandy, not clear. But, you can do it for effect. If you are going for an older/weathered effect, than noise is great!
Aug 22, 2011 21:35:03 #
I forget if you used to shoot film. If you did then rember if you used to use higher asa films to get faster shutter speeds you would get photos that had a grainy look to them. Thats what noise is to a digital photo. you start seeing grainy pixels. The great thing is with many of the new Nikons you can shoot at unbeliveable isos and get little to no noise.
Aug 22, 2011 22:15:17 #
Yes, the EXPEED 2 processor in the new Nikons allows stunning use of very high ISOs, superior, ISO speed for speed, to photographic film.
That said, the new Nikons need proper continuous exposure, that is, nothing dipping to zero candlepower (non photographic black) within the frame, particularly when using the auto ISO modes of these cameras.
I have been toying with the idea of using the Nikon D7000 to shoot an independent feature film. In goofing with many settings, I have a good example of the camera, at high ISO, ramping ISO in jet black areas to create clean exposure next to big noise in the same frame.
Below, I have uploaded a frame with this phenomenon from a D7000 1080 24p test I did from a hotel room in Panama City, Panama. The school bus on the street is reasonably clean, but the buildings to the left are awash in noise. Likely, this server will shrink the image down, which was 1080x1920, and so the noise may not be so obvious. In motion, it is unusable.
It points out, MANUAL control is best in working with video on the D7000. Still, I wish this technology existed 30 years ago when I was making olde school, Academy Award nominated short films. The modern world is very empowering. In fact, we are editing a Canon 7D shot feature film in my "Edit Suite B" as I type here in "A."
That said, the new Nikons need proper continuous exposure, that is, nothing dipping to zero candlepower (non photographic black) within the frame, particularly when using the auto ISO modes of these cameras.
I have been toying with the idea of using the Nikon D7000 to shoot an independent feature film. In goofing with many settings, I have a good example of the camera, at high ISO, ramping ISO in jet black areas to create clean exposure next to big noise in the same frame.
Below, I have uploaded a frame with this phenomenon from a D7000 1080 24p test I did from a hotel room in Panama City, Panama. The school bus on the street is reasonably clean, but the buildings to the left are awash in noise. Likely, this server will shrink the image down, which was 1080x1920, and so the noise may not be so obvious. In motion, it is unusable.
It points out, MANUAL control is best in working with video on the D7000. Still, I wish this technology existed 30 years ago when I was making olde school, Academy Award nominated short films. The modern world is very empowering. In fact, we are editing a Canon 7D shot feature film in my "Edit Suite B" as I type here in "A."
Noise Example. Might not be big enough.
Aug 22, 2011 22:18:20 #
Here is a cropped noise area from the former shot, full resolution. Note the blotchiness. This is very hi ISO noise, probably ISO 25,000, shot in "Program" mode.
Close Up Showing Noise
Aug 22, 2011 22:23:07 #
To add to the Nikon D7000 video noise discussion, here is a single frame of ISO 2,500 sequence I shot of my model friend and oft house guest, the famous glamor model Liz Ashley.
The noise level is acceptable for feature shooting purposes. Far less granularity than film shot at much lower ISO ratings.
The image is labeled with info.
The noise level is acceptable for feature shooting purposes. Far less granularity than film shot at much lower ISO ratings.
The image is labeled with info.
Shooting Video at ISO 2,500
Aug 23, 2011 10:47:35 #
samiam]wrote-" keep reading about the "noise" in pictures and ways to get around it. What exactly is "noise"
Nothing more then electrons bouncing around. The higher your ISO setting the more your computer chip must be active to record the image - more activety, more electric movement the greater the likelhood some will get recorded. In film cameras the higher rated film used bigger grains on the film to be more sensitive to lower light. Two differnt things but yet the end result is very much alike. Keep your ISO setting as low as you can - many say 400 max, but that can be streatched. Keep in mind that as you set this you also effect you shutter and apeature. I hope I did not confuse you as much as myself.
Nothing more then electrons bouncing around. The higher your ISO setting the more your computer chip must be active to record the image - more activety, more electric movement the greater the likelhood some will get recorded. In film cameras the higher rated film used bigger grains on the film to be more sensitive to lower light. Two differnt things but yet the end result is very much alike. Keep your ISO setting as low as you can - many say 400 max, but that can be streatched. Keep in mind that as you set this you also effect you shutter and apeature. I hope I did not confuse you as much as myself.
Aug 23, 2011 19:45:19 #
Aug 23, 2011 19:53:32 #
an example of noise intentional done with high iso and then grain added in photoshop 7 for a film noir effect. :idea:
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