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Input is plotted along the horizontal axis, with shadows (the
dark areas of the image) to the left, highlights (the bright areas
of the image) to the right, and mid-tones in between. The left
end of the axis marks the minimum possible value for colors in
the selected channel (zero, or no color), the right end the maxi-
mum value. In the case of the master curve, the minimum value
represents areas of the input image that are a true black; the
maximum value represents areas that are a true white. Output
is plotted along the vertical axis, with the minimum possible
output value (again, zero, or no color) at the bottom and the
maximum output value at the top.
Reference: The Tool Chest
Input
When the cursor is moved over the curve edit display, the input
and output values for the point under the cursor are shown in
the input/output display. The input value represents the level of
the pixel in the original image, the output value the level of the
pixel after any changes to the curve have been applied.
Apply
check box
Changes to curves only apply when the check-box at the top
left of the Curves palette is checked. When this box is checked,
changes to curves will be visible in the image being edited. The
box can be checked and unchecked for a quick "before-and-
after" comparison, allowing you to see whether changes to curves
are having the desired effect.
Input/output
display
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