Image forming apparatus and image forming system

An image forming apparatus receiving and processing data transmitted from an image processing apparatus, the image forming apparatus comprising:

• a receiving unit receiving first data based on printing information, second data different from the first data and third data corresponding to the second data;
• a determination unit determining whether or not the first data received are processable;
• a requesting unit requesting the image processing apparatus to transmit the third data and to change a transfer mode from a first transfer mode allowing the first data to be transferred as they are to a second transfer mode allowing the second data to be sequentially transferred in a case where the determination unit determines that the first data are unprocessable, the requesting unit further requesting the image processing apparatus to transmit the second data serving as image information corresponding to the first data based on the third data received upon receipt of the third data from the image processing apparatus;
• and
• an image forming unit forming an image based on the second data received.

An image forming system comprising:

• an image processing apparatus and an image forming apparatus,
• the image forming apparatus receiving and processing data transmitted from the image processing apparatus, the image forming apparatus including:
• a receiving unit receiving first data based on printing information and second data different from the first data;
• a determination unit determining whether or not the first data received are processable;
• a requesting unit requesting the image processing apparatus to transmit processable second data serving as image information corresponding to the first data in a case where the determination unit determines that the first data are unprocessable;
• and
• an image forming unit forming an image based on the second data received, and
• the image processing apparatus including:
• a control unit generating the first data based on a print execution instruction, the control unit generating the second data based on the request from the requesting unit of the image forming apparatus;
• and
• a transmission unit transmitting the first data and the second data.

An image forming system comprising:

• an image processing apparatus and an image forming apparatus,
• the image forming apparatus receiving and processing data transmitted from the image processing apparatus, the image forming apparatus including:
• a receiving unit receiving first data based on printing information, second data different from the first data and third data corresponding to the second data;
• a determination unit determining whether or not the first data received are processable;
• a requesting unit requesting the image processing apparatus to transmit the third data and to change a transfer mode from a first transfer mode allowing the first data to be transferred as they are to a second transfer mode allowing the second data to be sequentially transferred in a case where the determination unit determines that the first data are unprocessable, the requesting unit further requesting to transmit the second data serving as image information corresponding to the first data based on the third data received upon receipt of the third data from the image processing apparatus;
• an image forming unit forming an image based on the second data received, and
• the image processing apparatus including:
• a control unit generating the first data based on a print execution instruction, the control unit generating the third data and the second data based on the request from the requesting unit of the image forming apparatus;
• and
• a transmission unit transmitting the first data, the third data and the second data.

A method for processing data, comprising the steps of:

• receiving first data based on printing information;
• determining whether or not the first data received are processable;
• requesting transmission of processable second data serving as image information corresponding to the first data in a case where the first data are determined to be unprocessable;
• receiving the second data;
• and
• forming an image based on the second data received.

A method for processing data, comprising the steps of:

• receiving first data based on printing information;
• judging whether or not the first data received are processable;
• requesting to transmit third data and to change a transfer mode from a first transfer mode allowing the first data to be transferred as they are to a second transfer mode allowing second data to be sequentially transferred in a case where the first data are judged to be unprocessable;
• receiving the third data;
• requesting to transmit the second data serving as image information corresponding to the first data based on the third data received upon receipt of the third data;
• receiving the second data;
• and
• forming an image based on the second data received.