Inkjet printer and inkjet recording method

An inkjet printer system comprising:

• an image data acquirer that acquires two or more sets of image data concerning images each being a recording target;
• a medium information acquirer that acquires medium information including information representative of a recording area concerning a recording medium in which the images are to be recorded;
• an output data generator that generates a set of output data by combining the two or more sets of image data such that two or more of the images corresponding to the image data are arranged so as to be in the recording area and not to be superposed on each other;
• and
• a recorder that records the two or more images by ejecting at least one ink onto the recording medium based on the output data while conveying the recording medium in a conveying direction;
• wherein
• the output data generator includes:
• an ink information acquirer that acquires, for each of the two or more images, ink information including an amount of ink required to record the image;
• a hard-to-dry index acquirer that acquires, for each of the images, a hard-to-dry index calculated from the ink information and indicating how difficult the ink is to dry;
• a first image setter that sets one of the images having a highest hard-to-dry index to be a first image;
• a first area setter that sets a first area in the recording area of the recording medium, the first area being upstream in the conveying direction;
• and
• a layout arranger that arranges the first image in the first area earlier than any other images;
• the hard-to-dry index acquirer calculates the hard-to-dry index based on an amount of ink per unit area of one of the images that is required to record the image;
• and
• the hard-to-dry index acquirer divides each of the images into a plurality of portions, calculates respective hard-to-dry index values for the portions, and uses a highest one of the hard-to-dry index values as the hard-to-dry index of the image data.