Transcript Color Vision - Mr. Hudnall
Slide 1
Color Models
Slide 2
Color Vision
The color-responsive chemicals in the cones are called cone pigments and
are very similar to the chemicals in the rods. The retinal portion of the
chemical is the same, however the scotopsin is replaced with photopsins.
Therefore, the color-responsive pigments are made of retinal and
photopsins. There are three kinds of color-sensitive pigments:
Red-sensitive pigment
Green-sensitive pigment
Blue-sensitive pigment
Each cone cell has one of these pigments so that it is sensitive to that color.
The human eye can sense almost any gradation of color when red, green
and blue are mixed.
Red, green, and
blue phosphor
dots from
standard
television screen.
Slide 3
Additive vs. Subtractive Color
Slide 4
Prism
Using a prism, we can
see that what we see
as “white light” is
actually made up of
all the colors of the
rainbow.
Slide 5
Subtractive Color
Subtractive color
systems start with
white light.
Colored inks,
paints, or filters
between the viewer
and the light
source or reflective
surface subtract
wavelengths from
the light, giving it
color
Slide 6
Subtractive Color
The CMYK model works by
partially or entirely
masking colors on a
lighter, usually white,
background. The ink
reduces the light that
would otherwise be
reflected. Such a model is
called subtractive because
inks “subtract” brightness
from white.
Slide 7
CMYK
In most color printing, the primary ink
colors used are cyan, magenta, and
yellow. Cyan is the complement of
red, meaning that cyan acts like a
filter that absorbs red. The amount
of cyan applied to a paper will
control how much red will show.
Magenta is the complement of
green, and yellow the complement
of blue.
Combinations of different amounts of
the three inks can produce a wide
range of colors; this is how artwork
reproductions are mass-produced,
though for various reasons a black
ink is usually used as well. This
mixture of cyan, magenta, yellow
and black is called CMYK.
Slide 8
Additive Color
An additive color model
involves light emitted
directly from a source.
The primary colors
of additive light:
red, green and blue
(RGB) are used to
create other colors.
Slide 9
Additive Color
• Combining one
additive color with
another produces the
additive secondary
colors: cyan, magenta,
and yellow.
• Combining all three
additive colors results
in white.
Slide 10
RGB
James Clerk Maxwell is
credited as being the
father of additive color.
He photographed a tartan
ribbon on black-and-white
film three times, first with
a red, then green, then
blue color filter over the
lens. The three black-andwhite images were
developed and then
projected onto a screen
with three different
projectors, each equipped
with the corresponding
red, green, or blue color
filter used to take its
image.
Slide 11
Additive Color
The additive
color system is
used in
computer
monitors and
TVs. If you are
designing for a
computer
screen, choose
the RGB
Color Model
Color Models
Slide 2
Color Vision
The color-responsive chemicals in the cones are called cone pigments and
are very similar to the chemicals in the rods. The retinal portion of the
chemical is the same, however the scotopsin is replaced with photopsins.
Therefore, the color-responsive pigments are made of retinal and
photopsins. There are three kinds of color-sensitive pigments:
Red-sensitive pigment
Green-sensitive pigment
Blue-sensitive pigment
Each cone cell has one of these pigments so that it is sensitive to that color.
The human eye can sense almost any gradation of color when red, green
and blue are mixed.
Red, green, and
blue phosphor
dots from
standard
television screen.
Slide 3
Additive vs. Subtractive Color
Slide 4
Prism
Using a prism, we can
see that what we see
as “white light” is
actually made up of
all the colors of the
rainbow.
Slide 5
Subtractive Color
Subtractive color
systems start with
white light.
Colored inks,
paints, or filters
between the viewer
and the light
source or reflective
surface subtract
wavelengths from
the light, giving it
color
Slide 6
Subtractive Color
The CMYK model works by
partially or entirely
masking colors on a
lighter, usually white,
background. The ink
reduces the light that
would otherwise be
reflected. Such a model is
called subtractive because
inks “subtract” brightness
from white.
Slide 7
CMYK
In most color printing, the primary ink
colors used are cyan, magenta, and
yellow. Cyan is the complement of
red, meaning that cyan acts like a
filter that absorbs red. The amount
of cyan applied to a paper will
control how much red will show.
Magenta is the complement of
green, and yellow the complement
of blue.
Combinations of different amounts of
the three inks can produce a wide
range of colors; this is how artwork
reproductions are mass-produced,
though for various reasons a black
ink is usually used as well. This
mixture of cyan, magenta, yellow
and black is called CMYK.
Slide 8
Additive Color
An additive color model
involves light emitted
directly from a source.
The primary colors
of additive light:
red, green and blue
(RGB) are used to
create other colors.
Slide 9
Additive Color
• Combining one
additive color with
another produces the
additive secondary
colors: cyan, magenta,
and yellow.
• Combining all three
additive colors results
in white.
Slide 10
RGB
James Clerk Maxwell is
credited as being the
father of additive color.
He photographed a tartan
ribbon on black-and-white
film three times, first with
a red, then green, then
blue color filter over the
lens. The three black-andwhite images were
developed and then
projected onto a screen
with three different
projectors, each equipped
with the corresponding
red, green, or blue color
filter used to take its
image.
Slide 11
Additive Color
The additive
color system is
used in
computer
monitors and
TVs. If you are
designing for a
computer
screen, choose
the RGB
Color Model