1. A color processing device comprising: a processor configured to execute: a color data acquisition section configured to acquire color data of a first image output by a first image forming device on a basis of image data, the acquired color data being acquired by causing an image reading device to read the first image; and a first-relationship generation section configured to generate a first relationship between the image data and the acquired color data, the first relationship being generated by applying a first correlation between the image data and the acquired color data to at least one first relationship candidate prepared in advance, the at least one first relationship candidate spanning a color gamut wider than a color gamut of the acquired color data, and by matching the image data with the acquired color data using the at least one first relationship candidate, wherein the acquired color data is in a first color space and the image data is in a second color space, wherein the at least one first relationship candidate comprises a predetermined color profile, the predetermined color profile describing a relationship between the first color space and the second color space, wherein the first-relationship generation section is configured to determine a Euclidean distance between a first piece of data of the first correlation and a second piece of data of the at least one first relationship candidate, and wherein the first-relationship generation section is configured to adjust the first relationship according to the determined Euclidean distance.