=O"'I1------+-----The
picture
is
formed from
many
elements.
•
320
Pixels
Each
element
is
called a pixel.
iE~--f------Pixels
are
used
together
to
build
larger
graphic objects •
...
•
640
Pixels
In normal resolution
mode,
320 pixels
fill
a horizontal line.
In
high
resolution
mode,
640 pixels
fill
a horizontal line.
Figure
3-2:
What
Is a Pixel?
The
Amiga has four basic display modes - interlaced, non-interlaced,
low
resolution,
and high resolution. In non-interlaced mode, the normal play
field
has a height of 200
video lines. Interlaced mode gives finer vertical resolution - 400 lines
in
the same phy-
sical display area. In low-resolution mode, the normal play
field
has a width of 320 pix-
els. High-resolution mode gives finer horizontal resolution -
640
pixels
in
the same phy-
sical display area. These modes can be combined, so you can have, for instance, an
interlaced, high-resolution display.
Note
that
the dimensions referred to as "normal" in the previous paragraph are nominal
dimensions and represent the normal values you should expect
to
use. Actually, you can
display larger playfields; the maximum dimensions are given in the section called "Bit-
Planes and Playfields of All Sizes." Also, the dimensions of the playfield
in
memory are
often larger than the playfield displayed on the screen. You choose which
part
of this
larger memory picture
to
display by specifying a different size for the display window.
30 Playfield Hardware
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