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More precisely, my approach was to take a series of shots, then firstly to subtract dark frames from each shot, secondly to use the mean of the series for the foreground to further reduce noise, and thirdly … Instead of reducing noise, the darkframe subtraction: increased the noise- or rather, added some dark/monochrome noise. changed the white-balance/tinted the image. …

This is mostly used by astronomers and is fine for dark areas (the space between stars) as the noise is reduced to black but obviously not so good for long exposures with lighter tones where black pixels … To counter this two variations seem to be used Subtract the dark frame from the light frame then use a despeckle filter targeting the the dark pixels. …

To reduce noise, I'm trying to take a dark frame. However, with the lens covered up totally, there is absolutely no noise in the image. The whole frame is uniformly black. … You can plainly see the bright bit, containing noise (especially towards the bottom). However, either side there is no noise what so ever. I have selected the black area with a tolerance of 0. …

To understand the relationship between noise level (standard deviation) and ISO, I capture a sequence of dark frames with varied ISO (3 frames for each ISO, and other settings are identical). … The dark frames are recorded in a lightless environment with camera lens capped on, thus the std value of a frame should reflect the noise level there. …

How can I reduce the noise? Can the LCD refresh rate be lowered so that it produce a brighter and less noisy image? I use a Canon 650D. …

What is an effective means of determining the average dark current/noise of a camera image sensor? … My understanding is that this is type of noise is temperature dependent, what other factors may influence the dark current magnitude? …

The problem is that - especially considering it's winter here - that it gets dark pretty early. … This isn't a huge problem, as there are some things that look better in the dark, but I keep running into issues with noise. For example The camera has four ISO settings, 50, 100, 200, and 400. …

I have subsequently come to learn of the technique of dark frame subtraction to reduce fixed pattern noise. … An alternate version of the same question is...when does dark frame subtraction become desirable? …

Possible Duplicate: What is noise in a digital photograph? This happens while talking photos on dark or night. The Black color is not black, it has some noise. … What would be the reason for noise creation and how can I reduce that while talking photos?? …

I took some photos at night and I didn't have long exposure noise reduction on. … My photo has quite a few hot pixels, here's a 100% crop of a part of the sky: Since long exposure noise reduction is sometimes called "dark frame subtraction", I naively thought I could just subtract …

I've noticed when I am in very low light (light that isn't in the same room I'm sitting in), when my eyes adapt to the dark that I see colored particles. … Do these colored particles resemble noise in the photography world? Something like high ISO noise, but the particles are less colored. …

In the book Image Sensors and Signal Processing for Digital Still Cameras, it says that Read noise, or noise floor, is defined as noise that comes from the readout electronics.Noise generated in a detector … I remember that noise floor is dominated by dark electrons. What is the reason behind noise floor? In cameras, the output of sensors is subtracted by black level. …

Basically this is noise that will be the same for every image, regardless of exposure. dark noise caused by dark current in the photo diodes - pixels. … You can experiment by covering your lens and taking "dark frame" images for different exposure lengths to see the effect of dark noise for your sensor. …

When my Pentax K-r applies long exposure noise reduction (dark-frame subtraction), the processing time required for this operation is less than the exposure time. … For example, my camera may perform noise reduction for 10 seconds after a 15 second exposure. Why? …

I have been told that this photo has terrible noise. I wasn't aware of this fact! :redface: Morning scene, F4.8, Shutter: 1/50, ISO 100, Focal 14.4mm. … The fog was dense of course, but still it wasn't "too" dark. Canon Powershot SX210 IS Why is there too much noise in a fog photograph? Small sensor - the culprit? …