1. A non-transitory storage medium having stored therein a game program which causes a computer in a game apparatus for displaying an image of a virtual game space, which is shot by a virtual camera, to execute: image generation for generating the image of the virtual game space, which is shot by the virtual camera; first color blending for 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; two-dimensional second color blending for 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, a second color into a color at the another pixel; and outputting the image which has been processed at the second color blending.