Color is a perceptual attribute arising from the optical spectrum reaching an observer and the observer's visual processing and viewing conditions. Cone cells have overlapping spectral sensitivities, so their responses do not provide a separate measurement of every wavelength. Different optical spectra can therefore produce the same color match, an instance of metamerism.
For a transmitting sample, the incident optical spectrum is modified by wavelength-dependent transmittance. Removing part of the blue band can make the remaining light appear yellow, but the absorption maximum alone does not specify the resulting shade. Changing the illuminant or background can change color appearance without changing the sample.
Articles by others on the same topic
Color is a characteristic of visual perception described through categories, such as red, blue, green, etc. It arises from the way objects reflect, emit, or transmit light. Here are some key points about color: 1. **Light and Wavelengths**: Color is fundamentally tied to light. The visible spectrum of light ranges from approximately 380 nm (violet) to 750 nm (red). Different wavelengths of light correspond to different colors.