An image processing apparatus comprising: a processor including: a correction control point setting unit configured to assign a correction control point to a first color-space value in a first color space dependent on a first output device; and a color chart generator configured to: convert the first color-space value to which the correction control point is assigned into a second color-space value in a second color space dependent on a second output device, the second color space different from the first color space; displace the second color-space value by a predetermined amount while maintaining lightness; convert a displaced second color-space value into a displaced first color-space value in the first color space; and generate a color chart including a plurality of patches including a displaced-value patch generated based on the displaced first color-space value; an image forming device to output the color chart; and a colorimeter to perform colorimetry of the plurality of patches of the color chart, wherein the processor further includes: a correction parameter generator configured to generate a correction parameter to correct an output profile with a colorimetric value generated by the colorimeter; and an output profile correction unit to correct the output profile using the correction parameter, and wherein the second color space is an HSL color space with high lightness uniformity, wherein the second color-space value is different from the first color-space value wherein the first color space is a CMYK color and wherein the second color-space value is reversely converted into the first color-space value, thereby creating a chart for correction of the first color-space value. a correction control point setting unit configured to assign a correction control point to a first color-space value in a first color space dependent on a first output device; and a color chart generator configured to: convert the first color-space value to which the correction control point is assigned into a second color-space value in a second color space dependent on a second output device, the second color space different from the first color space; displace the second color-space value by a predetermined amount while maintaining lightness; convert a displaced second color-space value into a displaced first color-space value in the first color space; and generate a color chart including a plurality of patches including a displaced-value patch generated based on the displaced first color-space value; convert the first color-space value to which the correction control point is assigned into a second color-space value in a second color space dependent on a second output device, the second color space different from the first color space; displace the second color-space value by a predetermined amount while maintaining lightness; convert a displaced second color-space value into a displaced first color-space value in the first color space; and generate a color chart including a plurality of patches including a displaced-value patch generated based on the displaced first color-space value; an image forming device to output the color chart; and a colorimeter to perform colorimetry of the plurality of patches of the color chart, wherein the processor further includes: a correction parameter generator configured to generate a correction parameter to correct an output profile with a colorimetric value generated by the colorimeter; and an output profile correction unit to correct the output profile using the correction parameter, and wherein a correction parameter generator configured to generate a correction parameter to correct an output profile with a colorimetric value generated by the colorimeter; and an output profile correction unit to correct the output profile using the correction parameter, and wherein the second color space is an HSL color space with high lightness uniformity, wherein the second color-space value is different from the first color-space value wherein the first color space is a CMYK color and wherein the second color-space value is reversely converted into the first color-space value, thereby creating a chart for correction of the first color-space value.