A method for limiting an amount of ink discharged in a photocurable inkjet printing apparatus that performs printing using inks of four CMYK colors, the method comprising: a conversion step (S50) of converting, for each ink color, an input grayscale value to an amount of ink; and a limit value setting step (S52) of setting, regarding the amount of ink obtained in the conversion step (S50), a limit value of an amount of ink discharged, for each of secondary colors not including a K color component, tertiary colors not including a K color component,, a primary color including a K color component, secondary colors including a K color component, tertiary colors including a K color component, and quaternary colors including a K color component, wherein in the limit value setting step (S52), the limit value for the tertiary colors not including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color component, the limit value for the primary color including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color component, the limit value for the secondary colors including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color component , the limit value for the tertiary colors including a K color component is set a smaller value than the limit value for the secondary colors not including a K color component, and the limit value for the quaternary colors including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color components. a conversion step (S50) of converting, for each ink color, an input grayscale value to an amount of ink; and a limit value setting step (S52) of setting, regarding the amount of ink obtained in the conversion step (S50), a limit value of an amount of ink discharged, for each of secondary colors not including a K color component, tertiary colors not including a K color component,, a primary color including a K color component, secondary colors including a K color component, tertiary colors including a K color component, and quaternary colors including a K color component, wherein in the limit value setting step (S52), the limit value for the tertiary colors not including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color component, the limit value for the primary color including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color component, the limit value for the secondary colors including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color component , the limit value for the tertiary colors including a K color component is set a smaller value than the limit value for the secondary colors not including a K color component, and the limit value for the quaternary colors including a K color component is set to a smaller value than the limit value for the secondary colors not including a K color components. <EOS>