Direct 3D uses Microsoft Clear Type technology to improve the process of onscreen text. The Clear Type is based on the fact that every pixel on a system monitor is composed of red, blue and green sub pixels. Text is displayed by lighting up entire pixels without clear types. Round edges on separate visual characters are comprised of a series of rectangular blocks. The type of fixed pixels can appear jagged and hard to read.
Antialiasing technology used to clear type smoothes the rough edges of onscreen type. All the three type of sub pixels in Clear Type lights through which the curve or line of a character passes. This Clear type technology works because human vision is more sensitive to changes, in light intensity than it is to variations in color.
A small range of color accurate around the edges of a piece of type, then improves the contrast between dark and light. The main disadvantage to clear types comes for sharpness. The clear type text reproduced will view color fringing around the edges, due to the non-lighting of some colored sub pixels.
