Color Adjustment (All Color Cameras Except Aca2000-165 And Aca2040-90) - Basler acA2040-55 User Manual

Features
7.14.3.4 Color Adjustment (All Color Cameras Except
acA2000-165 and acA2040-90)
The camera's color adjustment feature lets you adjust hue and saturation for the primary and
secondary colors in the RGB color space. Each adjustment affects those colors in the image where
the adjusted primary or secondary color predominates. For example, the adjustment of red affects
the colors in the image with a predominant red component.
Basler recommends to also use color adjustment when using a light source preset.
This allows to make better use of the camera's color enhancement capabilities.
If no appropriate light source preset is available you can perform the desired color
corrections using the color transformation matrix.
See Section 7.14.3.5 on
transformation matrix.
The RGB Color Space
The RGB color space includes light with the primary colors red, green, and blue and all of their
combinations. When red, green, and blue light are combined and when the intensities of R, G, and
B are allowed to vary independently between 0% and 100%, all colors within the RGB color space
can be formed. Combining colored light is referred to as additive mixing.
When two primary colors are mixed at equal intensities, the secondary colors will result. The mixing
of red and green light produces yellow light (Y), the mixing of green and blue light produces cyan
light (C), and the mixing of blue and red light produces magenta light (M).
When the three primary colors are mixed at maximum intensities, white will result. In the absence
of light, black will result.
The color space can be represented as a color cube (see Figure 108 on
primary colors R, G, B, the secondary colors C, M, Y, and black and white define the corners. All
shades of gray are represented by the line connecting the black and the white corner (see
Figure 108 on page 287)
For ease of imagination, the color cube can be projected onto a plane (as shown in Figure 108)
such that a color hexagon is formed. The primary and secondary colors define the corners of the
color hexagon in an alternating fashion. The edges of the color hexagon represent the colors
resulting from mixing the primary and secondary colors. The center of the color hexagon represents
all shades of gray including black and white.
The reproduction of any arbitrary color of the RGB color space will lie within the color hexagon. The
color will be characterized by its hue and saturation:
Hue specifies the kind of coloration, for example, whether the color is red, yellow, orange etc.

Saturation expresses the colorfulness of a color. At maximum saturation, no shade of gray is

present. At minimum saturation, no "color" but only some shade of gray (including black and
white) is present.
286
page 290 for more information about the color
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