8. The apparatus according to claim 7 , characterized in that the reuse management module comprises: an acquisition unit for acquiring transparent Forms repeatedly referenced in the page description file; a determination unit for determining whether a transparent Form repeatedly referenced can be reused in a type of mandatory replacement reuse; if so, determining the transparent Form as a reusable transparent Form and its reuse type is mandatory replacement reuse; otherwise, further determining whether the transparent Form repeatedly referenced is an isolated group; if so, determining the transparent Form as a reusable transparent Form and its reuse type is normal transparent reuse; if the transparent Form repeatedly referenced is a group but not an isolated group, further determining whether resources contained in the transparent Form repeatedly referenced have a superimposition and whether all blend models are normal; if so, determining the transparent Form as a reusable transparent Form and its reuse type is normal transparent reuse; otherwise, determining the transparent Form as a non-reusable transparent Form.
7. A raster processing apparatus of a transparent Form, characterized in comprising: a reuse management module for making determination on transparent Forms repeatedly referenced that have been found in a RIP page interpretation process to determine a reusable transparent Form in a page description file; a syntax interpretation module for performing syntax interpretation on the transparent Form to obtain a reuse type and position information of the transparent Form; generating a color block lattice, an Alpha block lattice, a Shape block lattice and their corresponding block attribute tables and block memory tables for the transparent Form, according to the reuse type and the position information, and transmitting the obtained reuse type and position information of the transparent Form and the generated lattices and corresponding block attribute tables, block memory tables to a manager operation module; the manager operation module for managing reusable transparent Forms, comprising: storing information outputted from the syntax interpretation module; establishing association relationships between different transparent Forms in a page description file; according to the reuse type of the transparent Form, computing on the generated data information to obtain and buffer assembling information of the transparent Form; an assembling manner determination module for determining an assembling manner of the transparent Form according to the reuse type of the transparent Form and graphics status of the page to be outputted, in the assembling of the transparent Form; and an assembling module for assembling the transparent Form into the page to be outputted according to the assembling manner determined by the assembling manner determination module and based on the assembling information and the association relationships.