6.9 LUT (HEIGHT INFORMATION)
6.9.1 Brightness/Contrast
Adjusts the contrast and brightness of the current image.
•
Brightness
Adjusts the brightness of the image. Numeric values can be set within the (–128 to
128) range. The smaller the value, the darker the image. The standard value is 0.
•
Contrast
Adjusts the contrast of the image. Numeric values can be set within the (0 to 256)
range. The smaller the value, the lower the contrast (gradient difference becomes
faint). Increasing the value increases contrast and makes it easy to view the gradient
difference, but the area in which the gradient exceeds the limit becomes larger
because the higher and lower limits of the gradient are limited. The standard value
is 128.
• γ
value
Adjusts the profile of the gradient change curve.
Here, image correcting calculation, called
γ
correction, is used.
The general expression for
γ
correction is given by the following equation.
K
I
O
×
=
γ
O: Output signal
I : Input signal
γ
:
γ
value
K: Correction signal
The numeric value can be set within the (0.1 to 10.0) range. The standard value is
1.0.
Given that brightness contrast is 128, the gradient change curve will be as follows
when the
γ
value is 0.5, 1.0 or 1.5. The gradient change curve is linear when the
γ
value is 1.0.
6-70
TMPM5200-2
