Colour Flashcards
What is colour influenced by?
- light source
- the subject
- the observer
What is metamerism?
the ability of an object to appear different under different sources of light
What does reflectance refer to ?
the way the object modifies the light
What is the reflectance of a glossy or shiny surface?
specular reflection
What is the reflectance of a dull or matte surface?
diffuse reflection
What is the reflectance of an absorbent surface?
no reflection
Light passes through a transparent object _________.
unaltered
Light does not pass through what kinds of objects?
opaque
The Munsell colour system divides colours into what categories?
- hue- shade
- value- contrast
- chroma- intensity
What is the purpose of the munsell colour system?
gives a very precise way of defining opaque colours
The CIELab colour system divides colour into what categories?
- lightness (L*)
- A (a*)
- B (b*)
What is the benefit of the CIELab colour system?
- more flexibility in defining colour between different materials
- colours can be matched between inks and monitors
The VITA shade guide is arranged in …
order of value
What are the problems with dental shade guides?
- inflexible - limited number of shades
- the shade guide is usually made from a different material to the restoration
- material batches can differ
