69Pinnacle Systems TARGA 3000
—The Video Input slider controls allow you to adjust various aspects of the color for the
video that is going to be captured. The controls work similarly to those found on a
television. The slider controls are as follows:
• Contrast -- In a video waveform this is how far the whitest whites are from the blackest
blacks. If the peak white is far away from the peak black, the image is said to have high
contrast. If the peaks are close together, the image will have low contrast (i.e., the image
will look “washed out”). Think of contrast as the overall gain control.
• Saturation -- The degree of colorfulness from neutral gray through pastel to saturated
colors. Another term for this is purity. Saturation does not mean the brightness of a color,
just how much “pigment” is used to make the color. The lower the white content, the
more saturated or pure is the color.
• Brightness -- This is the amount of overall luminance perceived. Brightness is the
intensity of the video level and refers to how much light is emitted by the display.
• Hue -- The property or wavelength of a color. Hue is the attribute of a color perception
for base colors such as red, yellow, green, and blue. Hue is completely separate from the
intensity or saturation of a color. A hue has only one wavelength associated with it while
a blend of hues, such as white, has multiple wavelengths. Therefore, white and black are
colors but not hues. The Hue control adjusts the subcarrier phase so that the displayed
“color” agrees with your conception. An example is the flesh tone of a person. This can
be adjusted over a “gamut” of red to green, but the “colors” within that gamut would have
the same hue.
• B-Y Gain -- Adjustments made here increase or decrease the peak-to-peak amplitude of
the B-Y (blue minus luminance) color channel.
• R-Y Gain -- Adjustments made here increase or decrease the peak-to-peak amplitude of
the R-Y (red minus luminance) color channel.
• B-Y Offset -- Adjustments made here cause a change in the DC level of the B-Y input,
which will increase or decrease the balance of color in the B-Y color components.
• R-Y Offset -- Adjustments made here cause a change in the DC level of the R-Y input,
which will increase or decrease the balance of color in the R-Y color components.
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