Nikon 25385 User Manual - Page 139

Quick Fix Tone Curve The Tone Curve tool provides you with a curve editor that controls the tonality of the image. Within the Tone Curve tool, you are presented with a curve that enables you to control the relationship of input luminosity values to output luminosity values. Click anywhere on the curve to add an anchor point. Move the anchor point to alter the relationship of input and output values. Moving a point up makes objects of that value brighter, while moving a point down makes objects of that value darker. The curve is automatically adjusted to ensure a smooth transition between each point added to the image. Anchor points can be removed by simply clicking and dragging the anchor point outside of the curve editor or by clicking on an anchor point to select it and pressing the delete key. The Tone Curve tool provides you with the following additional controls: ❏ White and Black Output Slider These two sliders enable you to set the maximum and minimum brightness levels of the image. By dragging the white output slider down, you darken the lightest luminosity level in the image, and by dragging the black output slider up, you lighten the darkest luminosity level in the image. These two sliders are often used if the darkest and lightest colors in the image should not be pure white (255, 255, 255) and pure black (0, 0, 0). ❏ Black Point Slider Move the black point slider to the right to set all luminosity values from the point you have selected to the left to complete black. This will redistribute all of the values to stretch the luminosity range to match the entire possible range of values. It is recommended that you move the black point slider all the way to the right to match up with the left-most information from the displayed histogram. This adjusts the current image so that the darkest values in the image match the darkest value that can be displayed in a digital file. ❏ Mid-Point Slider Move the mid-point slider either to the left or to the right in order to lighten or darken the mid-tones of the image. Chapter 15 - Edit List | Develop Section 137