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Rad Technique > Sensitometry > Flashcards

Sensitometry Flashcards

0
Q

2 scientist introduced sensitometry

A

Hurter

Driffield

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1
Q

Science of evaluating the perfomance of photographic materials

A

Sensitometry

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2
Q

Requires photographic emulsion be exposed to specified light source

A

Sensitometry

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3
Q

Plot of the density vs. amount of exposure

A

Characteristic curve

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4
Q

Characteristic curve is also called

A

Sensitometric curve
H&D curve
D log E curve

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5
Q

Exposure is plotted on

A

X-axis

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6
Q

Density is plotted on

A

Y-axis

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7
Q

Curves always assumes some form of

A

S or Sigmoid shape

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8
Q

Basis of sensitometry

A

Density

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9
Q

Density has a log value of

A

0-4

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10
Q

Density of 1

A

10% light transmission

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11
Q

Density of 2

A

1% light transmission

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12
Q

Density of 3

A

0.01% light transmission

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13
Q

Shaped like a step wedge to produced an exact and regular increase or decrease in exposure

A

Aluminum step-wedge / penetrometer

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14
Q

Prints a pre-exposed negative directly onto the film

A

Sensitometer

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15
Q

Measures the optical density of a portion of an image using a 0-4 scale

A

Densitometer

16
Q

The recorded density of the base and recorded density of the chemical fog

A

Basic fog

17
Q

Absorbed longer exposed of film

A

Blue tint

18
Q

Basic fog value should not exceed

A

0.25

19
Q

Ponit where the film shows a reaction to expose

A

Threshold

20
Q

Area rapidly increasing density

A

Toe

21
Q

Carries a very large amount of information

A

Straight line portion

22
Q

Straight line portion parts

A

True gamma
Average gradient
Latitude
Speed

23
Q

Where first reaction to exposure begins to falls off

A

Shoulder

24
Q

Max density which can be reached on the film

A

Max density

25
Q

Caused by the silver halide grain not being absorbed

A

Region solarization

26
Q

Equal to the slope of the straight line portion

A

Gamma

27
Q

True value of average contrast available on the film

A

Average gradient

28
Q

Useful exposure range of the film

A

Latitude

29
Q

Range of exposure value drawn from the intercepts of 2 net densities

A

Latitude

30
Q

Latitude is linked to the

A

Average gradient

31
Q

Defined by ANST, exposure required to produce a net densities

A

Speed

32
Q

Means that one film os 100% higher in speed than other (separation of log)

A

0.3

Rad Technique (13 decks)

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