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Moiré
- An undesirable pattern in color printing that results from incorrect screen
angles of overprinting halftones. Moires usually result when you scan a halftone or
when you scan images taken directly from a magazine (instead of scanning a
photographic original or a transparency).
Pixel
- A picture element, or a single unit of a graphic image used by the computer
to represent image information in a digital format. An image file, for instance, is
simply a representation of hundreds (or thousands) of pixels arranged closely
together in a grid so that they appear to form a picture.
Refresh rate
- The number of times that the image on the monitor display is drawn
each second. If the monitor has a refresh rate of 75 Hz, all the pixels from top to
bottom are cycled at 75 times a second. Refresh rates are important because they
control flicker, and higher refresh rates are better to eliminate eye strain and
headaches that result from low refresh rates and flickering.
Resolution
- The level of detail in an image, expressed in dots per inch or dpi. The
greater the dpi number, the higher the resolution and the resulting file size.
Reflective media
- Media capable of reflecting light; e.g., photographs, magazine
prints.
RGB (Red, Green, Blue)
- A color model in which every color is composed of a
varying amount of the colors red, green, and blue.
Saturation
- The intensity of a color, or the degree of color in a particular hue. For
example, the green leaves in a tree will appear "more green" if the color is saturated.
Shadows
- The darkest areas of an image.
