1. A computer-readable recording medium that stores therein a computer program that causes a computer to implement correcting a color balance of an image that includes a catch light area, the computer program causing the computer to execute: generating histograms of a gradation level of each pixel in the image for each color; identifying an area where a frequency of a gradation level of the histogram generated at the generating tends to decrease first starting from a highest gradation of the gradation level as the catch light area; and calculating a correction amount of the color balance using pixels except for pixels included in the catch light area identified at the identifying.