Methods and apparatuses for forming images on recording media of different
sizes are provided. The image forming procedure may include reading
setting information which includes the size of a substitute recording
medium from a storage and, when the size of the recording medium specified
by the print instruction is not available, executing a print instruction
by automatically changing the size of a recording medium to be used to the
size of the substitute recording medium based on the setting information.
The image forming procedure may further include invalidating the setting
information with respect to second and subsequent pages of the recording
medium of identical size during one print job. Additional
computer-readable storage media storing image forming procedures are also
provided.