An image forming apparatus includes an image forming unit that forms an image on a transfer medium on the basis of image data, a feeder that feeds the transfer medium, and a control unit that manages image data and controls the image forming unit and the feeder. In a case where a base image and an overprint image are printed by the same image forming apparatus, the control unit can manage first image data of the base image and second image data of the overprint image by associating the data with each other, and when a jam of the transfer medium is detected during output of an overprint image, the control unit causes a transfer medium to which the base image is output by the image forming apparatus to be replenished for print instead of a jammed transfer medium removed by jam processing.

In processing using a print data processing apparatus that parallelly interprets pages of print data, in the case where a command to reset the number of already interpreted pages is included in the print data, a certain page to be printed is not printed. In the case of detecting a command to invalidate contents interpreted hitherto, an interpreter stores the number of already interpreted pages at the time in point of the detection of the invalidation command in a cache. Then, the interpreter generates intermediate data in the case where the sum of the cached value and the number of already interpreted pages managed by the interpreter coincides with a processing-target page number.

In processing using a print data processing apparatus that parallelly interprets pages of print data, in the case where a command to reset the number of already interpreted pages is included in the print data, a certain page to be printed is not printed. In the case of detecting a command to invalidate contents interpreted hitherto, an interpreter stores the number of already interpreted pages at the time in point of the detection of the invalidation command in a cache. Then, the interpreter generates intermediate data in the case where the sum of the cached value and the number of already interpreted pages managed by the interpreter coincides with a processing-target page number.

An image forming apparatus includes an image forming unit that forms an image on a transfer medium on the basis of image data, a feeder that feeds the transfer medium, and a control unit that manages image data and controls the image forming unit and the feeder. In a case where a base image and an overprint image are printed by the same image forming apparatus, the control unit can manage first image data of the base image and second image data of the overprint image by associating the data with each other, and when a jam of the transfer medium is detected during output of an overprint image, the control unit causes a transfer medium to which the base image is output by the image forming apparatus to be replenished for print instead of a jammed transfer medium removed by jam processing.

In processing using a print data processing apparatus that parallelly interprets pages of print data, in the case where a command to reset the number of already interpreted pages is included in the print data, a certain page to be printed is not printed. In the case of detecting a command to invalidate contents interpreted hitherto, an interpreter stores the number of already interpreted pages at the time in point of the detection of the invalidation command in a cache. Then, the interpreter generates intermediate data in the case where the sum of the cached value and the number of already interpreted pages managed by the interpreter coincides with a processing-target page number.

In processing using a print data processing apparatus that parallelly interprets pages of print data, in the case where a command to reset the number of already interpreted pages is included in the print data, a certain page to be printed is not printed. In the case of detecting a command to invalidate contents interpreted hitherto, an interpreter stores the number of already interpreted pages at the time in point of the detection of the invalidation command in a cache. Then, the interpreter generates intermediate data in the case where the sum of the cached value and the number of already interpreted pages managed by the interpreter coincides with a processing-target page number.