Improving accuracy by sub-pixel smoothing in FDTD

A color image recording apparatus records a composite color image composed of a plurality of superimposed images of different colors on a recording medium. Each latent image represented by an image signal is formed in a first image recording medium on the recording medium, and then another latent image is formed in a second image recording medium, following the first image recording area, of the recording medium. Then, the latent image in the first recording medium is developed into a visible image by a developing unit with a developing solution containing toner particles of one color. When the recording medium is fed along, toner particles in any residual developing solution left in the developing unit are attracted to the latent image in the second image recording area of the recording medium.