Nikon 9235 Reference Manual - Page 74
Sampling the Image for Gray Point, For more information on, Preferences-Advanced Color
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Sampling the Image for Gray Point The gray point can also be set by direct sampling. Sampling the image leaves the selected pixel at its current brightness while adjusting color balance by altering the gray point for each of the component channels in the image. To sample the gray 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 gray point, keeping an eye on the color value display in the Information palette to identify pixels with a neutral input value (look for pixels that you think should be a neutral gray color in the final image). With the cursor over the target pixel, click the mouse button. The average of the input values for each of the channels in the selected pixel will be used as the reference value for the gray point. The cursor will return to its original shape, and the image will automatically be altered to reflect the new value for gray point (the weight assigned to each channel when determining the average value can be set using the "Gray point target" option in the Advanced Color tab of the Preferences dialog). Reference:The Tool Chest Pg. For more information on: 134 Preferences-Advanced Color 73
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