Color and Shade Matching Flashcards
the human perception of color results from the interaction of three elements
light source
object
observer
where does the perception of color lie
in the brain
where are neurons located in the eye
retina
what are the two photo-receptors
rods
cones
which of the two photoreceptors are the more numerous
rods
rods detect what type of light
low levels of light
can rods detect color
no - they help us see in grayscale
cones detect what type of light
bright light and provide color acuity
photoreceptors transmit through what nerve to reach the brain
optic
what are the 3 types of cones that are sensitive to what different wavelengths of light
red, blue, green (green and red are for more long wavelengths)
the most common color deficiency is an individual with partial green defect is known as
deuteranomaly
monochromacy/achromacy is
colorblind individuals who lack all three cones
Munsell’s color system forms the basis for the classification of colored objects in three dimension
hue
value
chroma
hue
the attribute in which an object appears red, orange, yellow, green, blue, etc
true colors
value
refers to the lightness of a colors and is a vertical scale from black to white
chroma
is related to variation in strength of the same color.
The further away from the achromatic vertical axis, the higher the chroma(strong, more intense). The closer the color is to the achromatic axis (value) the lower the chroma (pale,weak)
as chroma increases what happens to the hue
it becomes more specific
translucency
the degree to which an object scatters light upon transmission
how long does it take for retinal fatigue to occur
30 seconds or more
dentin is the primary source of what esthetic tooth characteristic
fluorescence
thick enamel is higher or lower in value compared to thin enamel
high
when color matching, what is the best light
white light that is similar to daylight
if a shade tab is placed onto of an adjacent tooth what is the effect on color matching
the shade will appear lighter because it is closer to the eye
(to avoid this, incline the shade 120 degrees)
