Datacolor Spyder3 Elite Help Manual page 87

Curves Window
Help Index
The Long Answer
The Curves Window provides a graphical display of the tonal response characteristics
of the monitor system. This includes representations of the monitor's default behavior,
the desired behavior and the actual behavior.
The x-axis of the graph represents all of the possible input values that can be sent to
the monitor in the range of 0-255 for Red, Green and Blue values.
The y-axis of the graph represents the actual measured output value of the monitor
corresponding to each input level. This axis is shown with 255 levels corresponding to
the range of actual measured output luminance values from minimum to maximum.
Channel
This menu allows you to choose to view plots for all channels simultaneously or to
view plots for just the Red, Green or Blue channels individually.
Curves
Target
When this checkbox is marked, a plot is shown of the desired (target) tonal response
that has been specified by the user. For example, if the user specifies a Target of
Gamma 1.8 then the plot that is shown for the Target Curve here in the Curves
Window will be for an ideal mathematical response curve of Gamma 1.8.
The target curves for the Red, Green and Blue channels are identical and therefore
draw right on top of each other. In Global mode you will only see a blue line because
that is the last channel drawn. The line will change to Red or Green if you choose to
view individual channels in the Channel menu.
Uncalibrated