In an inkjet recording device comprising a recording head for separately discharging ink for primary colors of cyan, magenta, and yellow and black in response to a recording signal based on image data, there are problems that (1) a secondary color of red, green, or blue is difficult to represent by adjusting primary colors and that (2) a good image cannot be obtained because of severe color mixing at the boundary between different secondary colors. To alleviate these problems, there is an inkjet recording device comprising a recording head for separately discharging ink for seven colors of cyan, magenta, yellow, black, red, green, and blue in response to a recording signal based on image data (see Patent Document 1).
According to the technique disclosed in Patent Document 1, ink per se can be adjusted without complex color processing, and the secondary colors of red, green, and blue are recorded with ink of red, green, and blue, respectively. This can reduce ink injection quantity and prevent the occurrence of blur at the boundary between different colors, which would otherwise cause problems especially in secondary colors.    [Patent Document 1] JP 8-244254 A