Patent ID: 6876467

Claim:
A printer with an automatic density adjusting function that prints a color image on a color photographic paper that has a cyan (C) layer, a magenta (M) layer and an yellow (Y) layer by producing a color of each layer, said printer comprising: a test pattern data producing device that produces test pattern data for printing test patterns of red (R), green (G) and blue (B) colors on said color photographic paper; a printing device that prints the test patterns of R, G and B colors on said color photographic paper according to the test pattern data; a light source that has bright line spectrums of R, G and B colors and throws lights onto the test patterns of R, G and B colors; a light-receiving sensor that has spectral sensitivity characteristics in wavelength areas of R, G and B colors and measures amounts of reflected lights of the test patterns of R, G and B colors; a density measuring device that measures densities of C, M and Y colors according to the amounts of the reflected lights of the test patterns of R, G and B colors that are acquired from said light-receiving sensor; and an adjusting device that adjusts color production of the C, M and Y layers of said color photographic paper so that the measured densities of C, M and Y colors are target densities.