Luminance profiles demonstrate nonlinearities of brightness perception. Anstis, S. Behavior Research Methods & Instrumentation, 8(5):427--436, 1976.
Luminance profiles demonstrate nonlinearities of brightness perception [link]Paper  doi  abstract   bibtex   
A projector and cylindrical lens are used for displaying gratings and for simple demonstrations of Weber’s law, Fechner’s law, simultaneous contrast, and Fourier synthesis effects in vision.
@article{anstis_luminance_1976,
	title = {Luminance profiles demonstrate nonlinearities of brightness perception},
	volume = {8},
	issn = {1554-351X, 1554-3528},
	url = {http://link.springer.com/article/10.3758/BF03202171},
	doi = {10.3758/BF03202171},
	abstract = {A projector and cylindrical lens are used for displaying gratings and for simple demonstrations of Weber’s law, Fechner’s law, simultaneous contrast, and Fourier synthesis effects in vision.},
	language = {en},
	number = {5},
	journal = {Behavior Research Methods \& Instrumentation},
	author = {Anstis, Stuart},
	year = {1976},
	keywords = {Cognitive Psychology},
	pages = {427--436}
}
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