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Features
11.5 Brightness/Contrast
The Brightness/Contrast feature lets you make adjustments to the tonal values of your images.
You can adjust brightness and contrast by setting the BslBrightness, BslContrast, and
BslContrastMode parameters.
The BslBrightness and BslContrast parameter values are always processed together as parts of a
common Brightness/Contrast function, as described in the following sections.
11.5.1
Brightness
Adjusting the brightness allows you to lighten or darken the image by increasing or decreasing its
tonal values.
You can adjust the brightness by setting the BslBrightness parameter. The parameter value can
range from -1 to 1. By default, the parameter is set to 0, and no brightness adjustment is performed.
Adjusting the brightness moves the pivot point of the Brightness/Contrast function.
an example for the S-curve contrast mode set. For more information about contrast and contrast
modes, see Section 11.5.2 on
If you increase the brightness, the pivot point moves towards the upper left. As a result, the image
will appear lighter. Decreasing the brightness moves the pivot point to the lower right, and the image
will appear darker.
8-bit pixel values shown
as an example
250
200
150
100
50
0
50
100
Input pixel values
Fig. 38: Contrast = 0.3, Brightness = 0,
S-Curve Contrast Mode
86
page
87.
Pivot point
150
200
250
250
200
150
100
50
0
50
100
Input pixel values
Fig. 39: Contrast = 0.3, Brightness = 0.3,
S-Curve Contrast Mode
AW00136902000
Figure 38
shows
150
200
250
Basler dart BCON
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