Image forming apparatus, image forming method, and image forming program

An image forming method for continuously forming color images of a plurality of pages on one continuous paper in an image former that forms a color image by superimposing images of respective colors formed on respective different photoconductors on an intermediate transfer body, the image forming method comprising:

• performing job management for each color and generating print job data in which a margin region having a first width is set on an upstream side or a downstream side in a sheet passing direction of an image forming region of each page;
• detecting, in units of pages, a color shift amount of each color of the image forming region generated while printing related to the print job data is performed;
• and
• correcting a formation position of the image forming region to be a print target page next on the print job data for a color in which a color shift has occurred based on the color shift amount in a verification target page one or a plurality of pages before when printing related to the print job data is performed, wherein
• in the correcting,
• an entirety of the color shift amount is compensated by performing
• compensating for at least a part of the color shift amount by moving a formation position of the image forming region within the print target page in parallel in the sheet passing direction within a range of the margin region in a job of a color to be corrected of the print job data, and
• compensating for at least a part of the color shift amount by inserting an additional blank region having a second width that does not constitute a page between the print target page and an immediately preceding page in the job of the color to be corrected of the print job data.

A non-transitory recording medium storing a computer readable image forming program for continuously forming color images of a plurality of pages on one continuous paper in an image former that forms a color image by superimposing images of respective colors formed on respective different photoconductors on an intermediate transfer body, the image forming program comprising:

• performing job management for each color and generating print job data in which a margin region having a first width is set on an upstream side or a downstream side in a sheet passing direction of an image forming region of each page;
• detecting, in units of pages, a color shift amount of each color of the image forming region generated while printing related to the print job data is performed;
• and
• correcting a formation position of the image forming region to be a print target page next on the print job data for a color in which a color shift has occurred based on the color shift amount in a verification target page one or a plurality of pages before when printing related to the print job data is performed, wherein
• in the correcting,
• an entirety of the color shift amount is compensated by performing
• compensating for at least a part of the color shift amount by moving a formation position of the image forming region within the print target page in parallel in the sheet passing direction within a range of the margin region in a job of a color to be corrected of the print job data, and
• compensating for at least a part of the color shift amount by inserting an additional blank region having a second width that does not constitute a page between the print target page and an immediately preceding page in the job of the color to be corrected of the print job data.