The colorimetric characterization of digital color devices is the basis of image copy and color management process. Aiming to provide convenience for general users to characterize camera, based on studies of the characterization using instruments to measure samples under two office environments of daylight lighting during the day and fluorescent lighting at night, a characterization scheme that a user does not use professional instruments under daylight lighting is presented, but on one condition that the user has ColorChecker standards 24 color card. The characterization accuracy is studied, and experimental results show that, using professional instruments to measure samples, the characterization accuracy is 3.5~3.9 CMC (11) color difference units under environments of fluorescent (lighting and daylight lighting); not using instruments, the characterization accuracy is 3.75 CMC (11) color difference units under the environment of daylight lighting, and the difference of characterization accuracy is very small between using and not using instruments; not using instruments, the characterization accuracy varies in 0.5 CMC (11) color units at the condition of daylight changes in illumination and color temperature during sunny day from 1200 to 1500.