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Anti-aliasing is a technique whereby the rough, jagged
edges of curved and diagonal lines are smoothed. In a
non-anti-aliased line the pixels in the image are either
a part of the line, or they are not. If the line is black
on a white background, the pixel must be either black, or
white. When the line is anti-aliased, the graphic program
tests the colors on both sides and calculates intermediate
shades. The pixels on the edge of the graphic, (line in this
case), are then colored with the resulting intermediate colors,
simulating a straight, smooth edge.
This difference between a line that has been anti-aliased and
one which has not is more readily apparent in an example
that has not been enlarged for the purpose of displaying
the intermediate shades. Note that in the example to the
right the grey shades blend with the colors on each side,
effectively removing the jagged edges.
Anti-aliasing is a technique whereby the rough, jagged
edges of curved and diagonal lines are smoothed. In a
non-anti-aliased line the pixels in the image are either
a part of the line, or they are not. If the line is black
on a white background, the pixel must be either black, or
white. When the line is anti-aliased, the graphic program
tests the colors on both sides and calculates intermediate
shades. The pixels on the edge of the graphic, (line in this
case), are then colored with the resulting intermediate colors,
simulating a straight, smooth edge.
This difference between a line that has been anti-aliased and
one which has not is more readily apparent in an example
that has not been enlarged for the purpose of displaying
the intermediate shades. Note that in the example to the
right the grey shades blend with the colors on each side,
effectively removing the jagged edges.