Patent ID: 7609276

Claim:
A computer-readable information storage medium that stores a program for generating an image, the program causing a computer to function as: a drawing section which draws an object to generate image data; and an overdrive effect processing section which performs overdrive effect processing for the generated image data and generates image data to be output to a display section, wherein: the overdrive effect processing section generates image data subjected to the overdrive effect processing by performing alpha blending which calculates IMK+(IMK−IMJ)×α based on image data IMK generated in a Kth frame, image data IMJ generated by drawing an object in a Jth frame (K>J), and an alpha value α, and the overdrive effect processing section sets AS=(1=α)/2 in a double value mode in which a value twice a set value AS is set as a source alpha value A, sets BS=α in a fixed value mode in which a set value BS is set as a fixed destination alpha value B, and performs drawing while performing subtractive alpha blending which calculates IMK×A−IMJ×B=IMK×(2×AS)−IMJ×BS=IMK×(1+α)−IMJ×α.