TAILIEUCHUNG - Complete Guide to the Nikon D200- P9

Complete Guide to the Nikon D200- P9: As with all my books, a full draft was reviewed by volunteers to weed out unclear language and misstatements. This book is better because of them. | can apply exposure compensation after the fact. However note that due to the way digital images are captured noise is more prevalent in the dark areas of your image than it is in the bright areas78. Normally you don t see the noise as it is buried in very dark areas that print at or near black but when you use post processing techniques to boost shadow areas in an image you ll also be boosting noise perhaps into visible range. Note Photoshop histograms are calculated a bit differently than those the camera shows. One thing that confuses many NEF shooters is that Photoshop histograms only show the top 8 bits of data. If you use Capture to output 16-bit images to Photoshop be aware of that The D200 like the D2 series has the ability to show individual channel histograms. So what have we been looking at Well something called a luminance histogram which doesn t take color into account. If as I suggested earlier you primarily use the RGB Histogram instead of the plain Histogram display you ll get four histograms on the screen at once the luminance histogram white and a histogram for each of the Red Blue and Green channels. 78Why Because the signal to noise ratio for a pixel value of 1 1 1 is lower than one with a value of 254 254 254. Let s examine a hypothetical example to find out why. Let s say that your camera has random noise base that averages 2 photons. Further let s assume that the 1 1 1 value represents a photosite that s captured 100 photons. The signal to noise ratio for that pixel is 50 1. The 254 254 254 value represents capture of perhaps 10 000 photons so the signal to noise ratio is 5000 1. Thom Hogan s Complete Guide to the Nikon D200 Page 241 All the same things I said about the luminance histogram apply to the individual channel histograms. Spikes at the right edge are blowouts in the highlights in the case of an individual channel which would be called a channel blowout as in I blew out the Red channel . Spikes at the left edge mean .

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