TAILIEUCHUNG - Complete Guide to the Nikon D200- P6

Complete Guide to the Nikon D200- P6: 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. | detail than with JPEG images resolution chart numbers are about 2-3 higher on average in my testing they can be considerably higher in NEF if you re using noise reduction in the camera . Post-processing exposure changes are also more easily made with NEF files these are not really exposure changes but changing of the linearity57 of the exposure which is why it works better to correct underexposed images instead of overexposed ones though note that underexposure definitely brings up more noise on a D200 so the amount of correction range you have will be dependent upon your tolerance for noise . You also gain full post-shooting control over color correction and white balance decisions with JPEG those decisions are irrevocably recorded in the data when the picture is taken . And as just noted you can usually correct slightly incorrect exposures. With JPEG images you re working from the camera s interpolation of the color and white balance. While you can often rebalance images using a program like Photoshop you re one step removed from the original information in digital media each interpolation of original data can result in lost data or changes to data. The more changes you make the more likely that artifacts of those changes become visible. Tip If storage space isn t a consideration strongly consider shooting in one of the image qualities that saves both NEF and JPEG files for each image. This gives you the best of both worlds. If image space is a consideration remember that every NEF file embeds a JPEC Normal image in it that can be extracted if necessary. You may wonder what changing the linearity means. Normally each rise in bit value represents an equal corresponding rise in brightness when we change the linearity we change the progression. Instead of a data increase of say 16 being output as a value 16 higher we might lower that number . an increase of 16 is output as an increase of 8 or raise it . an increase of 16 is output as an increase of 32 .

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