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"So if it's one Raw sensor frame, it will be noisy," That is not why noise is created in digital photographs. And Noise or Grain in a photograph is not always
by FollowingTheDao 2y ago
"So if it's one Raw sensor frame, it will be noisy,"
That is not why noise is created in digital photographs. And Noise or Grain in a photograph is not always a negative.
"Noise in photography is the arbitrary alteration of brightness and color in an image. The onset of this random variation generates what is called “noise”or “grain”, which is basically formed by irregular pixels misrepresenting the luminance and tonality of the photograph. These pixels are visible to the eye due to their large size."
A signal RAW image does not have to have noise. Noise can be created by incorrect exposure and low light.
>Or you could store one post-processed frame, after you have combined 128 frames and done the computational photography stuff. But at that point, it isn't exactly raw data anymore.
Yes, and Apple should not be calling any images it captures from an iPhone "RAW".
- viraptor 2y ago> A signal RAW image does not have to have noise. Noise can be created by incorrect exposure and low light. You always have noise. It's more noticeable in low light, but it never goes away. It's due to physics - there's real world noise in photons hitting the sensors and read noise in the A/D converters behind them. That's long before the image is captured into any format - RAW doesn't help you here.
- spider-mario 2y agoThere is always noise. In fact, in absolute terms, there is more of it as the amount of light increases. It just increases more slowly than the signal, so the signal-to-noise ratio increases.