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Image parameters contd

Contrast adjustment

Adjusting the tone alters the shape of the 'S curve' used to map the linear image data captured by the sensor into the correct gamma. A lower contrast setting maintains more of the original data's dynamic range but leads to a flatter looking image. A higher contrast setting stretches the grayscale (dark to light) of the image and could lead to clipping of both shadow detail and highlights. The K20D provides a good range of contrast adjustment with even more steps in each direction (-4 to +4) than the K10D.

  Thumbnail Luminosity histogram
-4
0
+4

Color saturation adjustment

Saturation adjustment allows you to control the strength of color in the final image. Using the default 'Natural' image tone the chances are that color saturation is strong enough to deliver pleasing images while avoiding clipping of any particular color channel when taking shots of bright colors. That said the 'Bright' image tone can indeed cause the clipping, especially with strong reds. Hence you may wish to apply some negative saturation adjustment in this case. Good to see a wide latitude of adjustment with plenty of steps.

  Thumbnail 50% crop
-4
0
+4

Color Hue adjustment

New for the K20D is a Hue/Toning adjustment (as seen on most recent Nikon DSLRs). As well as shifting the hue slightly from cooler (minus numbers) to warmer (plus numbers) this control works with the color toning function in Monochrome mode (shifting the hue of the toned image). Not something you'll use that often, but a nice addition to an already extensive set of tonal controls.

  Thumbnail 50% crop
-4
0
+4

 

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