Nikon 9235 Reference Manual - Page 71
Sampling the Image for White Point or Black Point, For more information
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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 final image. Similarly, you can match the white point to a pixel in the brightest area of the image containing details important to the final 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 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 find the pixel that you want to use to set the white point, keeping an eye on the color value display in the Information palette to identify the pixel with the highest input value. 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 reflect the new value for white point. To sample the image for the black point, click the button and move the eyedropper cursor over the image until you find the point that you want to use to set the minimum input value, then click the mouse button to select the black point. Setting white/black points for the current channel By default, sampling sets the white point or black point for all channels. To set the white point or black point for the current channel only, sample the image while holding down the Ctrl key (Windows) or option key (Macintosh) on the keyboard. To adjust brightness and contrast without affecting color, select the master channel and sample the image while holding down the Ctrl key (Windows) or option key (Macintosh) on the keyboard. Pg. For more information on: 135 Setting the sample-point size Reference:The Tool Chest 70