are vector images?
The Book, "Macromedia FLASH 5 Using Flash"
published by Macromedia, Inc. 2000
vector and bitmap graphics
display graphics in either vector or bitmap format.
graphics describe images using lines and curves, called vectors,
that also include color and position properties. For example,
the image of a leaf is described by points through which lines
pass, creating the shape of the leaf's outline. The color
of the leaf is determined by the color of the outline and
the color of the area enclosed by the outline.
you edit a vector graphic, you modify the properties of the
lines and curves that describe its shape. You can move, resize,
reshape, and change the color of a vector graphic without
changing the quality of its appearance. Vector graphics are
resolution-independant, meaning they can be displayed on output
devices of varying resolutions without losing any quality.