Method for determining color and chromaticity coordinates according to the original image
In this paper, a description is given of the method of colorimetry of an image of an object under investigation according to its photograph or scanned copy. Further, in the text of the article, more briefly, this method will be called photo colorimetry. In general, in the science of color measurement, there are two directions: it is just colorimetry, where color is measured using a colorimeter, and the second is indirect colorimetry, in which color coordinates are calculated using known formulas from the measured optical spectrum or reflected from the object of light or the emission spectrum (for self-luminous objects). Photo colorimetry is based on specially developed software and includes having a computer with a monitor screen running this program. A photo of the object under study is displayed on the computer monitor, which can be a part of the human body (skin), on which some injuries or unwanted objects are visible. The process of measuring the coordinates of color and chromaticity itself is carried out by the method of pixel scanning of the image and the program determines the quantitative values of the primary colors of the monitor screen. Knowing the chromaticity coordinates of the primary colors of the screen (the triangle of color gamut), you can accurately calculate the chromaticity coordinates of the object under study. This is the principle of photo colorimetry.