Image forming system

An ink jet printing apparatus for performing printing using an ink jet head by ejecting ink to a printing medium from said ink jet head, comprising;

• processing means for executing magnifying processing with the aid of a hardware for image data having the magnifying processing executed therefor, said image data being fed from a host apparatus, and
• printing operation controlling means for allowing the printing operation to be performed by driving said ink jet head based on the image data which have been subjected to magnifying processing by said processing means.

An image forming method comprising the steps of;

• dividing an magnifying rate applicable when an magnified image is printed on a printing medium based on image data, into a plurality of partial magnifying rates of which multiplication represents said magnifying rate,
• executing a plurality of processings at said partial magnifying rates by executing processings inclusive of at least magnifying processing with the aid of a hardware and a software, and
• executing outputting for each printing operation based on the image data obtained from said magnifying processing.

A printed product already subjected to printing, comprising;

• a group of dots each having a same density, dots in said group being arranged with a predetermined pattern, and
• a pattern composed of a plurality of dots among said groups, a density of the group in said pattern establishing the linear relationship relative to a density of each of two groups located adjacent to said group on the opposite sides of the latter.