Apparatus and method for obtaining object-color component data

An image capturing apparatus comprising:

• an illuminator for changing an illumination environment around a subject, wherein the illuminator has a light emitting part emitting light to said subject;
• an image sensor for obtaining an image of said subject;
• a first memory for memorizing first image data obtained by said image sensor with illuminating by said illuminator;
• a second memory for memorizing second image data obtained by said image sensor without illuminating by said illuminator;
• a difference data calculator for calculating difference data between said first image data memorized in said first memory and said second image data memorized in said second;
• a spectral reflectivity calculator for calculating spectral reflectivity of said subject based on the difference data and relative spectral distribution of light from said light emitting part to obtain subject data;
• and
• an illumination data calculator for calculating illumination data on the basis of the second image data and said subject data, wherein said illumination data indicates influence of an illumination environment on the second image data.