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Leaf colors of a plant can be used to identify stress level due to itsadaptation to environmental change. For most leaves green-related colors aresourced from chlorophyll a and b. Chlorophyll concentration is normallymeasured using a spectrophotometer in laboratory. In some remote observationplaces, it is impossible to collect the leaves, preserve them, and bring themto laboratory to measure their chlorophyll content. Based on this need,measurement of chlorophyll content is observed through its color. Using CIEchromaticity diagram leaf color information in RGB is transformed intowavelength (in nm). Paddy seed with variety name IR-64 is used in observationduring its vegetation stage t (age of 0-10 days). Light exposure time {\tau} ischosen as environmental change, which normally should be about 12 hours/day, isvaried (0-12 hours/day). Each day sample from different exposure time is taken,its color is recorded using HP Deskjet 1050 scanner with 1200 dpi, and itschlorophyll content is obtained from absorption spectrum measured usingCampspec M501 Single Beam UV/Vis Spectrophotometer after it is rinsed in 85 %acetone solution and the information from the spectrum is calculated usingArnon method. It has been observed that average wavelength of leaf color{\lambda}avg is decreased from 570.55 nm to 566.01 nm as is measured for t = 1- 10 days with {\tau} = 9 hours/day, but chlorophyll concentration C isincreased from 0.015 g/l to 3.250 g/l and from 0.000 g/l to 0.774 g/l forchlorophyll a and b, respectively. Other value of {\tau} gives similar results.Based on these results an empirical relation between concentration ofchlorophyll a Cc-a and its wavelength {\lambda}avg can be formulated.

Measuring Leaf Chlorophyll Concentration from Its Color: A Way in Monitoring Environment Change to Plantations