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5.4 Gamma Pattern Editing
♦
Graph Area
The graph area is a 256-dot
×
256-dot white square area bordered by black lines, where the
relationship between the input values of 0 to 255 (x axis) and output values of 0 to 255 (y
axis) is indicated in blue lines. Each graph dot represents one division (unit).
♦
Gradation
The input is displayed in black and white in 256 single-dot steps from 0 at the left border to
255 at the right border. The gama function of the scanner is displayed. After saving it, the
displayed (gray scale) gama function is fixed and constant. The output values are displayed
in single dots in relation to the input values and the brightness of the output equipment is
displayed. To ensure accurate display, the display must be set for "True-Color" or greater.
♦
Gamma
Calculation of the output values is based on the value
γ
entered in the edit box; the graph and
the gradation are then displayed. The values that can be input are integers greater than 0 or
fractions.
<<Formula>> Output = (input
÷
255)
γ
×
255 (Input = 0 - 255)
♦
Free Edit
Designates whether to enable editing of the graph area directly using the mouse cursor.
If this box is checked, the gamma pattern input edit box cannot be used and only editing
using the mouse cursor is supported.
♦
Smooth
Designates whether to smooth edited curves. This setting is only valid when Free Edit is
selected. In this setting, the curved lines drawn by the mouse are automatically smoothed.
This is reflected in the graph and gradation display.
♦
Reverse
Designates whether to reverse black and white. When this box is checked, the current output
values are converted to (255 - output values).