| abstract |
Appropriate gradation correction is performed when binary image data generated by halftone processing is received and printed. A binary image to be printed is divided into blocks (S12), and a gradation value Cin of the block is obtained from the number of dots in the block (S14). Inspection chart data including a dot pattern of a block corresponding to each Cin as a patch is generated (S16), and the inspection chart is changed for each exposure intensity (S22, S24) while gradually changing the exposure intensity of the printing apparatus. Is formed on the intermediate transfer body (S18), the printing density Dout of each patch formed is read, and the correspondence between Cin and Dout is stored (S20). Next, the exposure intensity for obtaining Dout corresponding to the target curve is obtained for each Cin (S28). Then, when printing binary image data, each block is exposed with an exposure intensity corresponding to the Cin of the block (S29). [Selection] Figure 2 |