COLOR & CESIA:
THE INTERACTION OF LIGHT AND COLOR José Luis CAIVANO caivano@fadu.uba.ar
University of Buenos Aires and Conicet (National Council for Research) Argentina
Grupo Argentino del Color
color
regular reflection (mirror-like) diffuse reflection (matte)
regular transmission (transparent) diffuse transmission (translucent)
cesia
color and cesia stimulus
sensation
depends on • illumination • object • observer is affected by
• visual context • adaptation • contrast • etc.
hue
bla ck
ne ss
value
hue
chromaticness
chroma
color
cesia
inherent color S 2050Y
perceived color S 2030Y
the same glass window
inherent cesia: P95, D0, L95
perceived cesia: P50, D0, L95
perceived cesia: P5, D0, L95
the same piece of glass
perceived cesia: P20, D0, L85
inherent cesia: P95, D0, L95
Explaining some questions…
nonspecular direction
nonspecular direction
matte surface
glossy surface
view from a nonspecular direction
specular direction
specular direction
matte surface
glossy surface
view from a specular direction
nonspecular direction
matte surface
nonspecular direction
specular direction
specular direction
glossy surface
comparison view from nonspecular direction matte glossy
view from specular direction matte glossy
glossy surfaces
black
white
white:
reflecting black
reflecting gray
154, 155, 153
178, 179, 175
reflecting white
205, 207, 206
(R, G, B values)
black:
reflecting black
reflecting gray
0, 0, 0
18, 15, 16
reflecting white
36, 36, 36
(R, G, B values)
glossy surfaces black
blue
red
green
yellow
white
blue:
reflecting black
2, 29, 122
reflecting gray
1, 50, 131
reflecting white
16, 72, 152
(R, G, B values)
red:
reflecting black
reflecting gray
87, 0, 1
101, 10, 4
reflecting white
102, 26, 29
(R, G, B values)
green:
reflecting black
1, 73, 20
reflecting gray
4, 90, 41
reflecting white
25, 108, 67
(R, G, B values)
yellow:
reflecting black
143, 100, 1
reflecting gray
173, 120, 6
reflecting white
193, 140, 29
(R, G, B values)
original black, gray and white images, as reflected on a glossy surface that is: blue
red
green
yellow
white
4, 2, 3
0, 0, 0
2, 29, 122
87, 0, 1
1, 73, 20
143, 100, 1
154, 155, 153
178, 174, 166
18, 15, 16
1, 50, 131
101, 10, 4
4, 90, 41
173, 120, 6
178, 179, 175
241, 241, 241
36, 36, 36
16, 72, 152
102, 26, 29
25, 108, 67
193, 140, 29
205, 207, 206
white
original image gray
black
black
(R, G, B values)
comparison of the colors in the previous slides
The glossy surface looks more saturated and darker. RGB: 76, 123, 201 HSL: 217, 62, 79 NCS: 2070 R80B matte finish
RGB: 17, 101, 196 HSL: 212, 91, 77 NCS: 2080 R80B glossy finish
two samples taken from the same material
The “same” color sample with different surface finishings (seen from a nonspecular direction).
matte
satin
glossy
lustrous
matte
satin
When the samples are seen from a specular direction… they result in different perceived colors.
opaque surfaces
color of the light: white angle of illumination/observation: avoiding specular reflection
black matte black glossy white matte white glossy
with different colors of the light
opaque surfaces black matte & glossy white matte & glossy
red
yellow
green
magenta
blue
cyan
black matte
black glossy
mirror
color of the light: white angle of illumination/observation: with interreflections and shadow
mirror
4 “whites”: • original • original reflected • enhanced • enhanced reflected
with different colors of the light
mirror red
yellow
green
magenta
blue
cyan
mirror
color of the light: white angle of illumination/observation: without interreflections and shadow
mirror
2 “whites”: • original • original reflected
with different colors of the light
mirror red
yellow
green
magenta
blue
cyan
transparent surface
color of the light: white angle of illumination/observation: with interreflections and shadow
transparent surface 4 “whites”: • original • original shadowed • enhanced • enhanced filtered
with different colors of the light
transparent surface red
yellow
green
magenta
blue
cyan
transparent surface
color of the light: white angle of illumination/observation: without interreflections and shadow
transparent surface 2 “whites”: • original • original filtered
with different colors of the light
transparent surface red
yellow
green
magenta
blue
cyan
Connection with environmental color design
door column wall glass frame defense base sidewalk
palette extracted from inherent colors: a limited range
palettes extracted from perceived color
palettes extracted from perceived color
palettes extracted from perceived color
palettes extracted from perceived color
COLOR & CESIA:
THE INTERACTION OF LIGHT AND COLOR José Luis CAIVANO caivano@fadu.uba.ar
University of Buenos Aires and Conicet (National Council for Research) Argentina
Grupo Argentino del Color