A Procedure For Setting The Color Enhancements - Basler acA2040-55 User Manual

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7.14.3.6 A Procedure for Setting the Color Enhancements

When setting the color enhancements on the camera, Basler recommends using the procedure
outlined below. You can change the camera parameters quickly and easily by using the Basler pylon
Viewer software.
Note: The procedure aims at producing a color reproduction on a monitor that is optimized for
human vision. The optimum for machine vision may require different color enhancement settings.
To set the color enhancements:
1. Arrange your camera so that it is viewing a scene similar to what it will view during actual oper-
ation. Make sure that the lighting for the scene is as close as possible to the actual lighting you
will be using during normal operation. (Using lighting that represents your normal operating
conditions is extremely important.)
Basler recommends placing a standard color chart within your camera's field of view when you
are adjusting the color enhancements. This will make it much easier to know when the colors
are properly adjusted. One widely used chart is the ColorChecker® chart (also known as the
Macbeth chart).
2. Make sure the settings for gain, black level, digital shift, auto target brightness are at their
minimums.
3. Set the LightSourcePreset parameter to the value that is most appropriate for your light
source. For example, If you use tungsten incandescent light select the Tungsten2800K light
source preset.
4. Begin capturing images and check the basic image appearance. Set the exposure time, black
level, and gain so that you are acquiring good quality images. It is important to make sure that
the images are not over exposed. Over exposure can have a significant negative effect on the
fidelity of the color in the acquired images. Generally, the settings for black level, digital shift,
auto target brightness, and particularly so for gain, should be as low as possible.
5. Adjust the white balance. Make sure a white or light gray object is imaged while white balance
is carried out. An easy way to set the white balance is to use the "once" function on the
camera's Balance White Auto feature.
6. Set the gamma value if necessary. When gamma is set correctly, there should be a smooth
transition from the lightest to the darkest gray scale targets on your color chart or on a gray
scale.
If the camera is set to light source preset parameter value Daylight5000K (default),

Daylight6500K or Tungsten2800K, the camera will automatically provide gamma encoded
images (according to sRGB) that should be displayed on the monitor with great color
fidelity. Accordingly, there should be little need to change the default setting of one for the
Gamma parameter.
If the camera is set to the LightSourcePreset parameter value "Off" the camera will provide

images without sRGB gamma encoding. In this case Basler recommends setting the
Gamma parameter value to 0.45.
7. Examine the colors and see if they are satisfactory at this point. If not, chose a different setting
for the LightSourcePreset parameter. Try each parameter setting and determine which one
gives you the best color results.
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