An image forming apparatus comprising: image forming means (10, 10Y, 10M, 10C, 10K) configured to form an image based on image data; correction means configured to correct image data based on a correction condition for forming an output image by the image forming means; an image bearing member configured to bear the image formed by the image forming means; transfer means (7Y, 7M, 7C, 7K) configured to transfer the image on the image bearing member to a sheet; measurement means configured to measure a measurement image on the image bearing member, and measure a test image on the image bearing member; conversion means configured to convert a measurement result of the measurement image based on a conversion condition; first generation means configured to generate the correction condition based on the measurement result converted by the conversion means; control means configured to control the image forming means to form a test image, control the measurement means to measure the test image on the image bearing member, and control the transfer means to transfer the test image formed on the image bearing member to the sheet; reception means configured to receive a user instruction corresponding to a result of comparison between a sample image and the test image by a user; and second generation means configured to generate the conversion condition based on the user instruction and the measurement result of the test image by the measurement means, wherein the test image on the sheet includes a first test image, a second test image, and an image indicating a position where the sheet is to be bent, and in a case where the sheet is bent along the position, a position of the first test image and a position of the second test image do not overlap with each other. image forming means (10, 10Y, 10M, 10C, 10K) configured to form an image based on image data; correction means configured to correct image data based on a correction condition for forming an output image by the image forming means; an image bearing member configured to bear the image formed by the image forming means; transfer means (7Y, 7M, 7C, 7K) configured to transfer the image on the image bearing member to a sheet; measurement means configured to measure a measurement image on the image bearing member, and measure a test image on the image bearing member; conversion means configured to convert a measurement result of the measurement image based on a conversion condition; first generation means configured to generate the correction condition based on the measurement result converted by the conversion means; control means configured to control the image forming means to form a test image, control the measurement means to measure the test image on the image bearing member, and control the transfer means to transfer the test image formed on the image bearing member to the sheet; reception means configured to receive a user instruction corresponding to a result of comparison between a sample image and the test image by a user; and second generation means configured to generate the conversion condition based on the user instruction and the measurement result of the test image by the measurement means, wherein the test image on the sheet includes a first test image, a second test image, and an image indicating a position where the sheet is to be bent, and in a case where the sheet is bent along the position, a position of the first test image and a position of the second test image do not overlap with each other.