1. An image-printing device comprising: a reading unit configured to read a sample image and an original image, the sample image having a sample characteristic amount indicating a characteristic of the sample image, the original image having an original characteristic amount indicating a characteristic of the original image; a sample characteristic amount extracting unit configured to extract the sample characteristic amount from the sample image; an original characteristic amount extracting unit configured to extract the original characteristic amount from the original image; an image converting unit configured tQ convert the original image based on both the sample characteristic amount and the original characteristic amount; and a printing unit configured to print the converted original image.