Image-forming apparatus and image-forming

An image-forming method by an image-forming apparatus that includes:

• a recorder to perform recording operation to give a color material to a recording medium which allows a portion of an incident light to penetrate;
• and an input section to accept input operation from external, and that forms each image on one surface and the other surface opposite to the one surface of the recording medium by the recording operation of the recorder and performs a setting up for adjusting of the image caused to be formed by the recording operation of the recorder, and the method comprising:
• a reference mark forming step of causing the recorder to form a first reference mark on the one surface of a first recording medium, and causing the recorder to form a second reference mark on the other surface of the first recording medium, wherein
• the first reference mark includes a scale indicating a coordinate corresponding to a relative position in a range of the relative position which is determined in advance in relation to a first image-forming region where a normal image which is a formation target is formed on the one surface,
• the second reference mark includes an indicator indicating a predetermined relative position in relation to a second image-forming region where the normal image is formed on the other surface, and the second reference mark is formed so that the position indicated by the indicator is in the range of the relative position which is determined in advance according to the scale of the first reference mark when the second reference mark is seen from a perpendicular direction to the one surface of the first recording medium, and
• the image-forming method comprises:
• an input step of accepting, with the input section, an input operation of a coordinate which is read from the scale in the position indicated by the indicator;
• an adjustment step of performing a setting up for an adjustment of the recording operation by the recorder so as to reduce a positional misalignment of the first image-forming region and the second image-forming region on both surfaces of a recording medium based on the coordinate input by the input section;
• and
• a normal image forming step of causing the recorder to form each adjusted normal image on the one surface and the other surface of a second recording medium which differs from the first recording medium based on the setting up for the adjustment by the adjustment step.