1. An image processing apparatus, comprising: an inputting unit configured to input image data including a first process color and a second process color; and a determining unit configured to determine a density of the second process color for a target pixel in the inputted image data on the basis of a density of the first process color in the target pixel and on a density of the second process color in a peripheral pixel of the target pixel, wherein, if a second density is higher than a first density, a density of the second process color for the target pixel determined by the determining unit in a case where a density of the first process color in the target pixel is the second density is higher than a density of the second process color for the target pixel determined by the determining unit in a case where a density of the first process color in the target pixel is the first density.