AIC 2011

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