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Hue, saturation brightness RGB Chromaticity PowerPoint PPT Presentation


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2. spectral colors . ????????????????????????????????????????????? ???? ???????? ??????????????? Wavelength colors ???????????????????????????????????????????Monochromatic colors ???? 650 nm ???, 530 nm ?????, 460 nm ???????. ??????????????????? ????????????? ????????????????????????

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Hue, saturation brightness RGB Chromaticity

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Hue saturation brightness rgb chromaticity

(Hue), (saturation) (brightness)

RGB

Chromaticity

5 -

  • (additive mixing)

    • (RGB)

    • : TV

  • (subtractive mixing)

1


Spectral colors

Wavelength colors

Monochromaticcolors

650 nm , 530 nm , 460 nm

White

Pink

Brown

spectral colors


Spectral colors1

? ?

spectral colors.


Color filters

(color filters)


Hue saturation brightness rgb chromaticity

HSB ( Hue, Saturation and Brightness) (photoshop)

HSB

Hue

Saturation

Brightness

Desaturatatedorange = saturatedorange + white

Bright white

Orange

Grey

Brown (same)

Black

Blue

Blue

Brightness

Hue

Saturation


Hue saturation brightness rgb chromaticity

2

metamers

?


Reflectance

Reflectance curve

(magenta) 1 100%

-

-

(Reflectance)

magentashirt


Hue saturation brightness rgb chromaticity


Hue saturation and brightness hsb

HSB Color tree

- -

H , S B (Photoshop)

hue

lightness

saturation

Hue, Saturation and Brightness (HSB)


Red green and blue r g b

( HSB);

() ()

(650 nm )

(530 nm )

(460 nm)

additive primaries (additive mixing )

Red, greenandblue (RGB)

http://www.colorado.edu/physics/2000/tv/colortv.html

yellow

650-nm red

530-nm green

magenta

cyan

460-nm blue


Complementary color

Y + B = W.

C + R = W

M + G = W

Note: spectral color spectral color ( spectral color )

yellow

red

green

magenta

cyan

blue

(Complementary color)

white


Hue saturation brightness rgb chromaticity

Additive mixing of primaries

Blue added to

green = cyan.

Green added to

red = yellow.

Red added to

blue = magenta.


Hue saturation brightness rgb chromaticity

Complementary colored lights(additive mixing)

Blue (primary)

and yellow.

Green (primary)

and magenta.

Red (primary)

and cyan.


Chromaticity diagrams

color tree HSB

spectral color

less saturated colors

saturated wavelengthcolors

saturated non-wavelengthcolors

Chromaticity diagrams


Hue saturation brightness rgb chromaticity

y

hue

hue

x

Lightness (z)

saturation

saturation

Chromaticity "tree"

3 numbers (x, y, z)

specify a color

color tree


Chromaticity

x y z

() x = 0.57 y = 0.28

x = 0.33 y = 0.33

chromaticity


Chromaticity1

700nm 500 nm ?

chromaticity


Chromaticity2

(0.33,0.33)

700 nm 490 nm

chromaticity


Chromaticity3

(dominant hue)

547 nm

chromaticity


Partitive mixing

(Partitive mixing)


Subtractive mixing

()

1. (Transmission)

2. (Reflection )

3. (absorption

()

(Subtractive mixing)


Color filters1

Color Filters


Hue saturation brightness rgb chromaticity

Cyan

filter subtracts

red

Yellow

filter subtracts

blue

A colored filter subtracts colors by absorption.

=

Incident white light

Only green

gets

through


Hue saturation brightness rgb chromaticity

=

Magenta

filter subtracts

green

Cyan

filter subtracts

red

A colored filter subtracts certain colors by absorption and transmits the rest

Incident white light

Only blue

gets

through


Hue saturation brightness rgb chromaticity

Magenta

filter subtracts

green

Yellow

filter subtracts

blue

A colored filter subtracts colors by absorption.

=

Incident white light

Only red

gets

through


Hue saturation brightness rgb chromaticity

( subtractive primaries) : (cyan) , (yellow) and magenta:

cyan

yellow

magenta


Hue saturation brightness rgb chromaticity

Colored surfaces subtract certain colors by absorbing them, while reflecting others

White in

White in

Green out

Magenta out

Magenta surface

absorbs (subtracts)

green.

Green surface

absorbs (subtracts)

red and blue (magenta).


Hue saturation brightness rgb chromaticity

Green light on a magenta surface appears colorless because green is absorbed

Magenta light on a green surface appears colorless because magenta is absorbed

Magenta in

Green in

No color

No color

Magenta surface

absorbs (subtracts)

green.

Green surface

absorbs (subtracts)

red and blue (magenta).


Hue saturation brightness rgb chromaticity

Rule:

Cool White ()


Hue saturation brightness rgb chromaticity

Question

What does yellow look like under blue light?

What does blue look like under blue light?

What does yellow look like under yellow light?

What does blue look like under yellow light?


Hue saturation brightness rgb chromaticity

(CMYK color) (halftone process)


Halftone

Halftone

  • Halftone dots.

  • : (lpi) or (dpi) (600dpi)


Color halftone

Color halftone

color halftoning CMYK


Hue saturation brightness rgb chromaticity

LCD


Hue saturation brightness rgb chromaticity

s-cones 450 nm (blue)

L-cones 580 nm (red)

i-cones 540 nm (green)

Light at any wavelength in the visual spectrum from 400 to 700 nm will excite these 3 types of cones to a degree depending on the intensityat each wavelength.

Our perception of which color we are seeing (color sensation) is determined by how much S, i and L resonse occurs to light of a particular intensity distribution.

Rule: To get the overall response of each type of cone, multiply the intensity of the light at each wavelength by the response of the cone at that wavelength and then add together all of the products for all of the wavenumbers in the intensity distribution

L-cones

i-cones

s-cones

Spectral response of cones in typical human eye

relative response


S m l

S,M,L


Hue saturation brightness rgb chromaticity

RGB

RGB Primaries are monochromatic energies

around 645.2nm, 526.3nm, 444.4 nm.


Color matching function

Color matching function

3


Hue saturation brightness rgb chromaticity

R G B -tristimulus values

r g b - color matching function

X Y Z -Tristimulus values

x y z - color matching function


Hue saturation brightness rgb chromaticity

RGB


Hue saturation brightness rgb chromaticity

CIE

International Commission on Illumination


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