LaCie blue eye 2, Руководство пользователя

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3. Color Management
page 8
LaCie blue eye 2
User’s Manual
The intensity of the light emitted by the red, green and blue
dot in each pixel is set as a function of three values
commonly called R,G and B. The R, G and B of a given pixel
can be set as any integer value from 0 to 255.
• A pixel set to R=255, G=255, B=0 has its red and green
dots emitting at maximum intensity and the blue dot not
emitting at all. The result is an intense yellow.
• A pixel set to R=128, G=128, B=128 has its three dots
emitting red, green and blue lights at a medium intensity.
The combined result is that this pixel is perceived as an
intermediate gray.
• A pixel set to R=0, G=0, B=255 has its red dot and its
green dot emitting no light and its blue dot emitting blue
light at its maximum intensity. The resulting pixel is globally
perceived as emitting an intense blue.
3.1.2. RGB Values Are Device-Dependent
As we noted earlier, every monitor has its own individual settings for reproducing the RGB, because monitor
manufacturers make very different choices as to the components that are used in their monitors. This leads to very strong
differences between the color produced by any given RGB settings on separate monitors.
Besides the different components, there are also several reasons for this variation. On a TFT, for instance, here are some of
the most important factors that come into consideration:
• the color filters used to create the dots of each pixel
• the nature of the backlights
• the light transmittance characteristics of the liquid crystal technology used in the display
• the brightness, contrast and other settings used on the monitor
• the age of the monitor
With this in mind, moving back to our example about the RGB setting to produce blue. We know that we’re getting the
color blue, but is the color of blue being displayed accurate? One particular monitor could display the blue as akin to sky
blue, another as Navy Blue, and another as another shade of blue. And this the case for all colors, not just blue.
Because the color that is actually produced by a given RGB setting is not necessarily the same from one monitor to
another, color scientists say that RGB values are device-dependent.
LIGHT VIEW AUTO SOURCE MENU SELECT
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