NATS 1870 Lecture Notes - Lecture 10: Radiometry, Reflectance, Visual Cortex
26 Mar 2020
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Extra notes on spectral reflectance curves and other graphs. Because an object reflects a range of wavelengths, and not a single wavelength, we can plot a graph of how much light is reflected at each wavelength: this is a spectral reflectance curve or reflectance spectrum. Can use any of these to label the x-axis https://www. sabic-ip. com/cxp/jsp/user/learnaboutcolor/colorbasicsdetail/reflectance_curves. jsp. The hue of a colour relates to where the peak(s) of the reflectance curve lie(s) Green yellow-green (wider peak reflects more wavelengths) The value of a colour relates to the height of the curve. Yellow usually covers both green and red parts of spectrum. Occasionally yellow objects reflect primarily yellow wavelengths but more often they span green+red. Orange & red reflect the longer wavelengths. High value tint of red (i. e. pink = red+white) peaks at red wavelengths, but all wavelengths are reflected fewer short wavelengths compared to long wavelengths.
