Operation Manual

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The Tool Chest — The LCH Editor
The Chroma Editor
The chroma editor is a useful tool for adjusting color satura-
tion. Steepening the curve increases saturation in the af-
fected range, making colors more vivid. Flattening the curve
results in fl atter, less vivid colors. Moving the gray point to
the left makes the image as a whole more vivid, while mov-
ing it to the right “averages out” differences between colors,
making the image grayer. One effective way to make full use
of the scanner’s dynamic range is to steepen the curve in the
portions of the histogram that contain the greatest number
of pixels, while leaving colors corresponding to a neutral gray
unaffected.
Item Description
Histogram
Shows the distribution of pixels of different chromas in
the input. The horizontal axis shows chroma, the verti-
cal axis the number of pixels.
Output
level sliders
Choose the maximum and minimum values for out-
put.
Black-point
slider
Choose the minimum input level.
Gray-point
slider
Set the gray point (gamma value).
White-point
slider
Choose the maximum input level.
Input/output
levels
Input and output levels for the point under the cursor
in the curve edit display.
Click to view the chroma distribution for the fi nal im-
age. Click again to view the input chroma distribu-
tion.
Restore the chroma curve to linear.
Restore all curves in the LCH Editor to linear.
Gray-point
slider
Output level
sliders
White-point slider
Black-point slider
Input/output
levels
Histogram