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Principles of Light The Science Behind Photography.

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Presentation on theme: "Principles of Light The Science Behind Photography."— Presentation transcript:

1 Principles of Light The Science Behind Photography

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

3 additive process subtractive process

4 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 GREENBLUE WHITE

5 1. White light is made up of equal amounts of red, blue and green light. RED GREENBLUE WHITE MAGENTA YELLOW CYAN

6 1. White light is made up of equal amounts of red, blue and green light. Cyan, Magenta, Yellow Combine EQUAL amounts of 2 PRIMARY colors SECONDARY COLORS RED GREENBLUE WHITE MAGENTA YELLOW CYAN

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

8 1. White light is made up of equal amounts of red, blue and green light. Cameras can see infrared and ultraviolet but we cannot.

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

10 2. Objects get their color from reflected 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

11 2. Objects get their color from reflected light.

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

13 2. Objects get their color from reflected light. You can change the color of an object by changing the light source!

14 3. Black objects absorb all 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?

15 Can you see this?

16 3. Black objects absorb all light. Can a camera see black? Can black be photographed? Will the film be exposed?

17 3. Black objects absorb all light. Camera cannot see black? Black cannot be photographed? The film will not be exposed?

18 4. Silver, when struck by light, turns black. Silver is the main ingredient in film/ photo paper because it is sensitive to light. Silverware and jewelry tarnishes.

19 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

20 4. Silver, when struck by light, turns black. Emulsion – silver particles suspended in a gel Base – support for the emulsion; paper or plastic EMULSION BASE

21 4. Silver, when struck by light, turns black. EMULSION BASE

22 5. Light travels in a straight path. Light travels in wavelengths.

23 5. Light travels in a straight path.

24 Images are recorded on film upside down and reversed. We see the same way.

25 5. Light travels in a straight path.

26

27 Larger lens opening, more light, blurry image Smaller lens opening, less light, sharper image Pupils dilated by eye doctor? Squint eyes to see better?

28 http://youtu.be/O0PawPSdk28


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