Color Enhancement Features On Aca750-30Gc And Aca2500-14Gc Cameras; White Balance - Basler ace acA640-90gm User Manual

Color Creation and Enhancement
8.5 Color Enhancement Features on
acA750-30gc and acA2500-14gc
Cameras
8.5.1

White Balance

On the acA750-30gc camera model, the colors output from the sensor are first converted to YUV
and are then transformed to RBG. Before being output from the camera, the colors are again
converted to the selected output format.
On the acA2500-14gc camera models, the Bayer-encoded color data produced by the sensor is
converted to RGB for internal processing and is finally converted to the selected output format.
The white balancing feature implemented in the camera acts on the colors when they are in the
RGB color space, so the feature lets you perform red, green, and blue adjustments. The purpose
of the feature is to let you adjust the balance of red, green, and blue such that white objects in the
camera's field of view appear white in the acquired images.
Setting the White Balance
This section (Section 8.4) describes how a color camera's white balance can be
adjusted "manually", i.e., by setting the value of the Balance Ratio Abs parameters
for red, green, and blue.
The camera also has a White Balance Auto function that can automatically adjust
the white balance. Manual adjustment of the Balance Ratio Abs parameters
for red, green, and blue will only work correctly if the Balance White Auto
function is disabled.
For more information about auto functions in general, see Section 10.9 on
page 211.
For more information about the Balance White Auto function, see Section 10.9.5
on page
With the white balancing scheme used on these cameras, the red intensity, green intensity, and blue
intensity can be individually adjusted. For each color, a Balance Ratio parameter is used to set the
intensity of the color. If the Balance Ratio parameter for a color is set to a value of 1, the intensity
of the color will be unaffected by the white balance mechanism. If the ratio is set to a value lower
than 1, the intensity of the color will be reduced. If the ratio is set to a value greater than 1, the
intensity of the color will be increased. The increase or decrease in intensity is proportional. For
example, if the balance ratio for a color is set to 1.2, the intensity of that color will be increased by
20%.
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