An image formation device adapted to form an image of dots in which multiple dot sizes are mixed by ejecting liquid droplets onto a recording medium, the image formation device comprising at least one recording head adapted to eject the liquid droplets, a head driving circuit adapted to control an ejection of the recording head, and an image processing section adapted to generate a control signal for causing the recording head to eject the liquid droplets, wherein the image processing section has a halftone processing section adapted to generate a dot image signal, which indicates states of dots by multi-value data for each color for chronologically controlling the ejection amount of the liquid droplets for execution of the ejection operation of the recording head, by performing halftone processing on a continuous tone image signal which indicates the image and, characterized in that when the continuous tone image signal is a signal indicating a tint image, the halftone processing section is adapted to generate the dot image signal to form at least one dot aggregation portion through arrangement for aggregation of dots (14L, 14S) with two or more dot sizes, on a part of a dot image which is indicated by the dot image signal, wherein aggregation of dots means that the dots are adjacent at respective closest positions wherein the closest position means a position where any one of the dots is adjacent to other dots in the vertical and the horizontal direction, and also through arrangement for non-aggregation of dots with at least one dot size of the two or more dot sizes, wherein non-aggregation of dots means that the dots are adjacent at second-closest positions, wherein the second closest position means a position where any one of the dots is adjacent to other dots in a diagonal direction. at least one recording head adapted to eject the liquid droplets, a head driving circuit adapted to control an ejection of the recording head, and an image processing section adapted to generate a control signal for causing the recording head to eject the liquid droplets, wherein the image processing section has a halftone processing section adapted to generate a dot image signal, which indicates states of dots by multi-value data for each color for chronologically controlling the ejection amount of the liquid droplets for execution of the ejection operation of the recording head, by performing halftone processing on a continuous tone image signal which indicates the image and, characterized in that when the continuous tone image signal is a signal indicating a tint image, the halftone processing section is adapted to generate the dot image signal to form at least one dot aggregation portion through arrangement for aggregation of dots (14L, 14S) with two or more dot sizes, on a part of a dot image which is indicated by the dot image signal, wherein aggregation of dots means that the dots are adjacent at respective closest positions wherein the closest position means a position where any one of the dots is adjacent to other dots in the vertical and the horizontal direction, and also through arrangement for non-aggregation of dots with at least one dot size of the two or more dot sizes, wherein non-aggregation of dots means that the dots are adjacent at second-closest positions, wherein the second closest position means a position where any one of the dots is adjacent to other dots in a diagonal direction.