An example image scanning apparatus includes a lighting unit to irradiate light onto a manuscript using an LED light source, a scan unit to generate a scan image by scanning image information of manuscript using light reflected by the manuscript, and a processor to control the lighting unit to irradiate light on each unit pixel by a predetermined duty during a movement process of the manuscript in a sub-scan direction.

In a case where it is determined that image processing on image data is executed not in parallel with other image processing different from the image processing and printing of an image of the document is started after reading of an image of a first page of the document is completed, a transfer rate of image data from an image reading unit to an image processing unit is set to a predetermined transfer rate. Whereas in a case where it is determined that the image processing on image data is executed not in parallel with the other image processing different from the image processing and printing of the image of the document is started without waiting for the reading of the image of the first page of the document to be completed, the transfer rate is set to a transfer rate lower than the predetermined transfer rate.

A printing system and method comprising a transport system configured to move a print target, a laser for directing energy on the print target, and a control system configured to adjust the energy directed on the print target according to a present speed of the print target the control system further comprising an analog control, a scrolling window control, a pulse width modulation control, and a halftone modulation control.

A light source drive control device includes: an image data generating part that generates line-thinned image data having been subjected to line thinning processing for thinning an edge pixel in image data by a first pixel width; an intensity information generating part that generates intensity information including a first intensity at which a pixel not included in a set second pixel width of an edge in the line-thinned image data is exposed and a second intensity at which a pixel included in the second pixel width is exposed and which is higher than the first intensity; and a light source driving part that drives a light source based on a light source modulation signal generated according to the line-thinned image data and a drive current data switched based on a drive current switching signal generated based on the intensity information.

A printing system and method comprising a transport system configured to move a print target, a laser for directing energy on the print target, and a control system configured to adjust the energy directed on the print target according to a present speed of the print target the control system further comprising an analog control, a scrolling window control, a pulse width modulation control, and a halftone modulation control.