Image forming apparatus and image forming method

An image forming apparatus comprising:

• an automatic document feeder (ADF) for carrying an original document;
• a scanner unit having a carriage including a light-source unit for exposing and scanning the original document, and is capable of operating in a first reading mode for reading image information of the original document carried by the ADF with the carriage fixed and a second reading mode for reading the image information of the original document by moving the carriage;
• an image processing unit for processing the image information read by the scanner unit and performing image conversion according to the reading magnification;
• a printer unit for processing the image information from the image processing unit and forming an image on a paper sheet;
• and
• a controller for controlling the scanning velocity of the original document by the scanner unit to make the setting the scanning velocity in the first reading mode higher than the scanning velocity in the second reading mode, and controlling the image conversion process in the image processing unit according to the reading magnification to control the output resolution of the printer unit in the fist reading mode and the second reading mode.

An image forming methods comprising:

• providing an automatic document feeder (ADF) for carrying an original document and a scanner unit having a carriage including a light-source unit for exposing and scanning the original document,
• causing the scanner unit to operate in a first reading mode for reading image information of the original document carried by the ADF with the carriage fixed, or in a second reading mode for reading the image information of the original document by moving the carriage;
• setting the scanning velocity of the original document by the scanner unit in the first reading mode to be higher than that in the second reading mode;
• performing image conversion for the image information read by the scanner unit in the first reading mode or the second reading mode according to the reading magnification;
• and
• processing the image information read by the scanner unit or the image information after having applied with the image conversion by the printer unit, and forming images on a paper sheet at different output resolutions in the first reading mode and the second reading mode.