Image forming apparatus for controlling to make the dot size of the highlight part different depending on the type of recording material, and method of controlling the same, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorTaichi Takemura
Life of this patent
Estimating the term…
Abstract
An image forming apparatus, for performing image forming by transferring and fixing an image formed on an image carrier to a printing material, that selects a smallest dot size of a halftone dot pattern representing a halftone of a highlight region corresponding to a type of the printing material, and uses a screen representing the selected smallest dot size to perform exposure control of the image carrier.
Claims16
An image forming apparatus including a forming unit, the image forming apparatus comprising:
- at least one memory device that stores a set of instructions;
- and
- at least one processor that executes the instructions stored in the at least one memory device to function as:
- a first obtaining unit that obtains a type of a sheet;
- a second obtaining unit that obtains an image;
- a selection unit that selects a screen from among screens including a first screen and a second screen based on the obtained type of the sheet, wherein a number of pixels representing a smallest halftone dot of the first screen is different from a number of pixels representing a smallest halftone dot of the second screen;
- a generation unit that performs halftone processing on the image using the selected screen to generate a halftone image, wherein a number of the smallest halftone dots of the first screen in the halftone image increases when a density of the image increases and a number of the smallest halftone dots of the second screen in the halftone image increases when a density of the image increases;
- and
- a control unit that controls the forming unit to form the generated halftone image on the sheet.
A method of controlling an image forming apparatus including a forming unit, the method comprising:
- obtaining a type of a sheet;
- obtaining an image;
- selecting a screen from among screens including a first screen and a second screen based on the obtained type of the sheet, wherein a number of pixels representing a smallest halftone dot of the first screen is different from a number of pixels representing a smallest halftone dot of the second screen;
- performing halftone processing on the image using the selected screen to generate a halftone image, wherein a number of the smallest halftone dots of the first screen in the halftone image increases when a density of the image increases and a number of the smallest halftone dots of the second screen in the halftone image increases when a density of the image increases;
- and
- controlling the forming unit to form the generated halftone image on the sheet.
A non-transitory computer-readable storage medium storing a program for causing a processor to execute a method of controlling an image forming apparatus including a forming unit, the method comprising:
- obtaining a type of a sheet;
- obtaining an image;
- selecting a screen from among screens including a first screen and a second screen based on the obtained type of the sheet, wherein a number of pixels representing a smallest halftone dot of the first screen is different from a number of pixels representing a smallest halftone dot of the second screen;
- performing halftone processing on the image using the selected screen to generate a halftone image, wherein a number of the smallest halftone dots of the first screen in the halftone image increases when a density of the image increases and a number of the smallest halftone dots of the second screen in the halftone image increases when a density of the image increases;
- and
- controlling the forming unit to form the generated halftone image on the sheet.
Dependencies are inferred from the claim text.