Nikon 4 Bedienungsanleitung PDF herunterladen (Seite 56)

Image Adjustment

White-Point and Black-Point Sliders

The white-point and black-point sliders can

be used to match the white and black points

to the his to gram displayed in the curve edit

display. While these sliders can be used to

edit curves for any channel, the best results

are usually obtained when they are used to

modify the master curve.

To edit the white point or black point, click

the corresponding slider once to activate it,

then drag it to the right or left (a value can

also be entered directly in the text box under-

neath the slider). Matching the black-point

slider with the lowest input value displayed

in the histogram will set the minimum output

value for the selected channel to the darkest pixel actually present in the image, steepening

the curve and enhancing contrast without sacriﬁ cing detail in shad ows. Similarly, matching

the white-point slider with the highest input value displayed in the histogram will set the

maximum output value for the selected channel to the brightest pixel present in the image,

enhancing contrast without loss of detail in highlights. Any changes are applied instantly to

the active image.

Sampling the Image for White Point or Black Point

The white point or black point can be set by directly sampling the image, allowing you to

choose the pixels that will be used to set the maximum (white point) or minimum (black point)

output value. This makes it possible to set the black point by matching it to a pixel in the

darkest part of the image containing detail you want to preserve, eliminating details in darker

areas that are not important to the ﬁ nal image. Similarly, you can match the white point to a

pixel in the brightest area of the image containing details important to the ﬁ nal image. While

direct sampling can be used with any channel, it is most effective when used with the master

curve. When the master curve is selected, sampling will set the white or black point for red,

green, and blue curves simultaneously; the master curve itself is unaffected.

To sample the white point, click the White Point button

. When the cursor is moved over

the active image, it will take the shape of an eyedropper. Move the cursor over the image to

ﬁ nd the pixel that you want to use to set the white point, keeping an eye on pixel level display

in the Information palette to identify pixels with high input values. With the cursor over the

target pixel, click the mouse button. The input value for the selected pixel will be used as the

input value for the white point. The cursor will return to its original shape, and the image will

automatically be altered to reﬂ ect the new value for white point.

To sample the image for the black point, click the Black Point button and move the

eye drop per cursor over the image until you ﬁ nd the point that you want to use to set the

min i mum input value, then click the mouse button to select the black point.

White-point slider

Black-point slider

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