Colour on screen
Coloured
objects can also be seen on a television screen or VDU by light emitted
from red, green and blue phosphors. A white colour will appear when all
the phosphors emit equal amounts of red, green and blue. This is called
additive colour mixing. The best way of observing these colours is in
a darkened room with no background light falling on the screen.
Additive colour
This
colour mixing is totally different to that of textile dyeing. The colours
which can be displayed on the screen will be limited by the RGB phosphors
and is called the gamut of that particular screen. A more familiar analogy
is that different shade ranges can be produced on the same substrate,
from different dye classes on cotton, i.e. reactive and sulphur dyes on
cotton.
If
a coloured object needs to be compared to one displayed on a screen the
object must be placed in a lighting cabinet illuminated with the correct
light source and viewing conditions.
Also See:
