1. A color-unevenness inspection apparatus comprising: an image pickup configured to pick up an image of an inspection target for a color-unevenness inspection; an image generator configured to generate an uneven-color image by determining one or more uneven-color regions existing in the picked-up image of the inspection target obtained by the image pickup, and by classifying unit regions included in each of the uneven-color regions into a plurality of color groups; a calculator configured to calculate, on the uneven-color regions in the uneven-color image, an evaluation parameter to be used in the color-unevenness inspection; a corrector configured to make a correction to the calculated evaluation parameter in consideration of a difference of color-unevenness visibility between the color groups; and an inspector configured to perform the color-unevenness inspection, based on a resultant evaluation parameter obtained by the correction, wherein the evaluation parameter includes an uneven-color area ratio defined as a sum of individual area ratio and includes a maximum chroma defined as a maximum value of chroma in a whole of the uneven-color regions, the individual area ratio being a ratio of an region value of the uneven-color region for each of the color groups to an region value of an entire region to be inspected.