1. A method of modifying color composition for a color-blind person in a mobile displaying apparatus containing a processor and a memory, the method comprising the steps of: causing a processor of said mobile displaying apparatus to evaluate the qualities of a particular user's color vision when the particular user does not provide information about said qualities employing by the processor of said mobile display apparatus a Farnsworth-Munsell (FM) chromaticity test for both achromatopsia and dichromatism and according to a total error scored (TES) of the FM chromaticity test, determining whether the user's color-blindness is achromatopsia or dichromatism; and modifying said color composition according to said qualities specific to the particular user, in which the color composition is modified over a range of 0 to 1.0 so the mobile displaying apparatus provides color composition based on a severity and classification of color-blindness customized for the particular user, in which the modified color composition is provided by the display apparatus for one of dichromatism and achromatopsia in accordance with a respective determining of the user's color-blindness by the FM chromaticity test.