Levenhuk C800 NG Digital Camera, USB 2.0 - Manual (Page 73)

Help Manual
65
and a B value of 50. When the values of all three components are equal, the
result is a shade of neutral gray. When the value of all components is 255, the
result is pure white; when the value is 0, pure black.
RGB images use three channels to reproduce up to 16.7 million colors
on-screen. In addition to being the default mode for new ToupView images, the
RGB mode is used by computer monitors to display colors. This means that
when working in color modes other than RGB , such as CMYK , ToupView uses
RGB mode for display on-screen.
Although RGB is a standard color mode, the exact range of colors represented
can vary, depending on the application or display device.
CMYK
The CMYK mode is based on the light-absorbing quality of ink printed on
papers. As white light strikes translucent inks, certain visible wavelengths are
absorbed while others are reflected back to the eyes.
In theory, pure cyan (
C ), magenta ( M ), and yellow ( Y ) pigments should
combine to absorb all light and produce black. For this reason these colors are
called subtractive colors. Because all printing inks contain some impurities,
these three inks actually produce a muddy brown and must be combined with
black (
K ) ink to produce a true black. ( K is used instead of B to avoid confusion
with blue.) Combining these inks to reproduce color is called four-color process
printing.
The subtractive (
CMY ) and additive ( RGB ) colors are complementary colors.
Each pair of subtractive colors creates an additive color, and vice versa.
HSI
Based on the human perception of color, the HSI model describes three
fundamental characteristics of colors:
Hue is the color reflected from or transmitted through an object. It is measured
as a location on the standard color wheel, expressed as a degree between 0°
and 360° . In common use, Hue is identified by the name of the color such as
red, orange, or green.
Saturation , sometimes called chroma, is the strength or purity of the color.
Saturation represents the amount of gray in proportion to the hue, measured
as a percentage from 0% (gray) to 100% (fully saturated). On the standard
color wheel,
Saturation increases from the center to the edge.