Principles of light
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Principles of Light. The Science Behind Photography. 1. White light is made up of equal amounts of red , blue and green light. additive process. subtractive process. 1. White light is made up of equal amounts of red , blue and green light. Red, Blue and Green Cannot be made

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Principles of Light

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Principles of Light

The Science Behind Photography


1. White light is made up of equal amounts of red, blue and green light.


additive process

subtractive process

1. White light is made up of equal amounts of red, blue and green light.


  • Red, Blue and Green

  • Cannot be made

  • Exist in Nature

  • PRIMARY COLORS

RED

WHITE

BLUE

GREEN

1. White light is made up of equal amounts of red, blue and green light.


RED

MAGENTA

YELLOW

WHITE

BLUE

GREEN

1. White light is made up of equal amounts of red, blue and green light.

CYAN


RED

  • Cyan, Magenta, Yellow

  • Combine EQUAL amounts of 2 PRIMARY colors

  • SECONDARY COLORS

MAGENTA

YELLOW

WHITE

BLUE

GREEN

1. White light is made up of equal amounts of red, blue and green light.

CYAN


  • Wavelengths of color are viewed on the spectrum.

  • Visible Spectrum = Rainbow

Water acts like a PRISM to REFRACT or BREAK APART white light into all colors

1. White light is made up of equal amounts of red, blue and green light.


Cameras can see infrared and ultraviolet but we cannot.

INVISIBLE

SPECTRUM

1. White light is made up of equal amounts of red, blue and green light.


VISIBLE

SPECTRUM

+

INVISIBLE

SPECTRUM

=

TOTAL

SPECTRUM

1. White light is made up of equal amounts of red, blue and green light.


  • All colored objects reflect light to some degree.

  • White objects reflect all the light that hits them.

  • Can only take a photograph when there is a light source.

  • No light = No color

2. Objects get their color from reflected light.


2. Objects get their color from reflected light.


Can you change the color of an object by changing the light source?

2. Objects get their color from reflected light.


You can change the color of an object by changing the light source!

2. Objects get their color from reflected light.


  • Black is not a color

  • It is the absence of color

  • Black objects absorb ALL the light that hits them

  • Inside if cameras, darkroom, developing tanks are black

  • WHY?

3. Black objects absorb all light.


Can you see this?


Can a camera see black?

Can black be photographed?

Will the film be exposed?

3. Black objects absorb all light.


Camera cannot see black?

Black cannotbe photographed?

The film will not be exposed?

3. Black objects absorb all light.


  • Silver is the main ingredient in film/ photo paper because it is sensitive to light.

  • Silverware and jewelry tarnishes.

4. Silver, when struck by light, turns black.


  • Film/photo paper has two main layers:

    • Emulsion

    • Base

  • Emulsion – silver particles suspended in a gel

  • Base – support for the emulsion; paper or plastic

4. Silver, when struck by light, turns black.


  • Emulsion – silver particles suspended in a gel

  • Base – support for the emulsion; paper or plastic

EMULSION

Curls towards

the emulsion

BASE

4. Silver, when struck by light, turns black.


EMULSION

Curls towards

the emulsion

PAPER = SHINY

FILM = LIGHTER

BASE

4. Silver, when struck by light, turns black.


  • Light travels in wavelengths.

5. Light travels in a straight path.


5. Light travels in a straight path.


  • Images are recorded on film upside down and reversed.

  • We see the same way.

5. Light travels in a straight path.


5. Light travels in a straight path.


5. Light travels in a straight path.


Pupils dilated by eye doctor?

Squint eyes to see better?

  • Larger lens opening, more light, blurry image

  • Smaller lens opening, less light, sharper image

5. Light travels in a straight path.


http://youtu.be/O0PawPSdk28


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