Quiz Three Flashcards
(31 cards)
What are the two types of densitometers?
Reflection and transmissive
When measuring film density, there are two areas that are used to determine the density quality of the film. One is D-min which is a measurement of the
Substrate
D-max represents the measurement for this part of the film and determines the opacity for the film’s ____________ area.
Image
The recommended D-max for the image area of the film should be between
3.8-4.0
Using the Murray/Davies formula to determine the Apparent Dot Area, D1 represent the film tint minus this
The density of the film base.
The purpose for measuring the Dot Area is to
Verify screen tints are correct
Density is a function of the percentage of light that is
Reflected
At 100% reflectance, the density reading will be
0
For the press operator, density helps determine whether this should be increased or decreased
Ink
The importance of density readings in printing is to maintain consistency in color control because
Of the press
When using the formula in determining Dot gain, D1 represents the density of the tint minus this
Density of substrate
The typical tight density tolerance for offset printing is
+/- .05
In four-color printing, the balance of dot gain between the three process colors yellow, magenta, and cyan is critical in order to maintain
Neutral gray
The “average” dot gain for sheet-fed, offset printing is
20%
This is an indication of the ability or inability of a printed ink to accept the next ink printed compared to how well the paper accepts that ink
Apparent trapping
Many factors influence trap. What are two of them
- Mechanical adjustment
- Sequence ink is laid down
- Amount of ink put down
- Tack & Viscocity
Hue Error is not really an “error” but a consideration for
Impurities
The gray component of a color indicates an amount of black in the ink and is measured with a densitometer as
Grayness
Control bars printed on the press sheets are used in order to control various variations that occur during the printing process. One element that adds to color variations is
Mechanical variables
This process involves getting a display to an optimal repeatable state
Calibration
One of the four variables needed to be set on a display is
- Brightness
- Contrast
- White Point
- Gamma Setting (default 2.2, other 1.8)
This setting refers to the color temperature of the monitor
Native white point
The Native White Point of a display is usually
6,500 and 7,500
The tone response curve is defined by this
Gamma
