1. A storage medium having stored there in a game program which causes a computer in a game apparatus for updating and displaying, at intervals of unit time, an image of a virtual game space, which is shot by a virtual camera, to execute: an image generation step of generating the image of the virtual game space, which is shot by the virtual camera; a first color blending step of blending, at a rate which is calculated in accordance with a distance from a predetermined reference position to another position in the virtual game space in a shooting direction of the virtual camera, a first color into a color at the another position in the image generated at the image generation step; a second color blending step of blending, at a rate which is calculated in accordance with a distance from a predetermined reference pixel to another pixel in the image into which the first color has been blended at the first color blending step, a second color into a color at the another pixel; and an output step of outputting the image which has been processed at the second color blending step.