The Electromagnetic Spectrum - Oki OKIPAGE 8c Plus Colour Manual

Light interacts with an object and what we see is the final
result of that interaction. An object can reflect, transmit or
emit light. A reflective object absorbs some sections of the
visible spectrum and reflects the rest. What we see is the
reflected portion. An object removing wavelengths at the ultra
violet end for example, will appear red in hue. A transmissive
object allows light to pass through it and may absorb a section.
The colour of the object in this case, will depend upon the
wavelengths of light that are allowed to pass through. An
emissive object emits light and the appearance of the light
will depend on the wavelengths emitted. In short, the
composition of the light and its interaction with the object
will define the colour we see.
1 micrometre = 1×10 -6 metre
1 nanometre = 1×10 -9 metre
1 picometre = 1×10 -12 metre
1 fentometre = 1×10 -15 metre
6
(0·001mm)
(0·000001mm)
(0·000000001mm)
(0·000000000001mm)

The electromagnetic spectrum

All colours we can see fall into what is the visible part of the
electromagnetic (EM) spectrum. The visible portion of the
EM spectrum is minute and although we are 'blind' to the
rest, the part we can see has a significant effect on our
perception of everything around us.
If light containing all visible wavelengths in balanced
quantities is detected, then white light is seen. If there is an
absence of all wavelengths then black is perceived. The
infinite combination of different wavelengths give rise to what
we perceive as colour. So colour is light.
When our eyes receive information containing a strong
content of a particular wavelength then we interpret that as a
colour. A strong content around 700nm (0.0007mm
wavelength) is interpreted as red and at the other end of the
scale, 400nm is interpreted as violet.
OKIPAGE 8c Plus