LaCie 130858 Manuel d'utilisateur télécharger pdf (Page 9)

LaCie blue eye pro Color Management

User Manual page 9

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. Be-

sides 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 accurately? One

particular monitor could display the blue as akin to sky blue, an-

other as Navy Blue, and another as another shade of blue. And

this is 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.

The Consequences Of Device Dependency

The direct consequence of this is that a given image (for instance

a digital photograph) will not necessarily appear the same on

two separate monitors. One may often observe color shifts, loss

of contrast or loss of detail.

As a result, considerable inefﬁciencies can appear in professional

workﬂows. When receiving a picture from its photographer, the

news agency may have the impression that some color correc-

tion needs to be performed on the photograph, even though it

may already have been done by the photographer before send-

ing the picture to the agency.

The same problem can occur when a printer receives digital art

included in their customer’s document. The colors displayed on

the printer’s monitor may not be identical to the ones displayed

at the customer site.

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LaCie 130858 Manuel d'utilisateur Page 9

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