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The luminosity editor is shown below.
Output level
sliders
Black point
slider
Input/output
levels
Item
Shows the distribution of pixels of different
luminosities in the input image. The horizon-
Histogram
tal axis shows luminosity (0–255), the vertical
axis the number of pixels.
Output level
Sets the maximum and minimum values for
sliders
output.
Black point
Sets the minimum input level.
slider
Reference: The Tool Chest
Histogram
Description
Item
Gray point
slider
White point
slider
Input/output
levels
White point
slider
Gray point
slider
Pg. For more information on:
134 Preferences—Advanced Color
Description
Sets the gray point (gamma value) for lumi-
nosity
Sets the maximum input level.
Luminosity input and output levels for the
point under the cursor in the edit display.
The distribution of pixels of different lumi-
nosities in the output image are displayed
when this button is clicked. Click again to
view the luminosity distribution for the input
image.
Restores the luminosity curve to linear. Con-
trol-click (Windows) or command-click
(Macintosh) to restore the curves for lumi-
nosity, chroma, and hue to linear.
Sets the maximum and minimum values for
input to values that exclude 0.5% of the
brightest and darkest pixels in the crop. The
percentage of pixels excluded can be adjusted
using the Advanced Color tab in the Prefer-
ences dialog.
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