1. An image forming apparatus, comprising: an electrostatic latent image bearer; a charger configured to charge the electrostatic latent image bearer; an irradiator configured to irradiate the electrostatic latent image bearer with imagewise light having an image resolution not less than 1,200 dpi to form an electrostatic latent image thereon; an image developer configured to develop the electrostatic latent image with a toner to form a toner image on the electrostatic latent image bearer; a transferer configured to transfer the toner image onto a recording medium; and a fixer configured to fix the toner image on the recording medium, wherein a time for a given point on the electrostatic latent image bearer to travel from a position right in front of the irradiator to a position right in front of the image developer is shorter than 50 msec and longer than a transit time of the electrostatic latent image bearer.