Aliasing is the effect in low resolution screens where a line looks like a stair step. It is more for lines having slopes less than 20 degrees and greater than 70 degrees. To overcome this antialising methods are used:
- Increase in resolution: BY increasing the resolution of screen the effect of aliasing can be minimized. By increasing resolution the line passes through twice many jags but each jag is half the size. This method is expensive.
- Unweighted area sampling: In this method the next closest pixels are selected. The intensity of pixel is proportional to the amount of line area occupied by the pixel.
- Weighted area sampling: In this method, the intensity of the pixel is dependent on the line area occupied and the distance of the area from the pixel’s center.