Nikon 25338 User Manual - Page 106
Double-Threshold, Photo Info
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Chapter 17 100 within the histogram with the Channels pull-down Menu. By default, all three channels (Red, Green, and Blue) are displayed. When all three channels are displayed, individual Red, Green, and Blue histograms are superimposed over one another. Where the individual histograms overlap, secondary colors are displayed. Areas that are white contain pixel values of all three colors at that value. Double-Threshold Photo Info You may also choose to display only the Red, Green, or Blue histograms individually. You can select an area of the histogram which will cause the pixels from the selected range to blink within the image window. To select a range, simply drag the mouse over the histogram display. Click Clear to cancel the current selection. Alternatively, you can manually indicate a starting value as well as an ending value for this range by typing the corresponding pixel values into the Start and End text boxes. Please note: Values for the different channels range from 0 to 255, with values for 12 and 16-bit images being scaled to fit in this range. The Double-Threshold checkbox enables you to determine the darkest and lightest colors within the current image. Check this box to turn on the Double-Threshold effect. This will add two sliders at the bottom of the Histogram window and cause the entire image to become neutral gray. By dragging the two sliders towards the center of the histogram window, you will begin displaying pixel values in the image. Drag the shadow slider to the right to begin displaying dark pixels (displayed as black pixels on the background). Dragging the highlight slider to the left will cause light pixels (displayed as white pixels on the background) will begin to be displayed. This feature is typically used to assist you with locating the lightest and darkest items for placing white and black points (either Control Points or points from within the Levels & Curves feature). It is recommended that you drag the sliders towards the center only