Objective The dot is always changing from the original to the substrate, especially in digital images. To study the method of controlling the dot gain is indeed beneficial in improving the quality of print. Methods The actual dot area of monochromatic black target with outputs was measured in monochrome mode. On the Matlab platform, the least square method was used to get dot gain curve by fitting the actual and ideal dot area, and then the dot compensation curve was obtained based on the estimated values. Finally, the curve was used to correct the dots. Results By measuring the dot area, the result showed that the target's average dot gain was 9. 1% before correction and was decreased to 0. 4% after correction. Conclusion Compared to the uncompensated printing, the compensated printing has a practical improvement in tone reproduction and brightness, which can effectively improve the printing output quality.