C. Alejandro Parraga author Jordi Roca author Dimosthenis Karatzas author Sophie Wuerger author 2014 A method for estimating the non-linear gamma transfer function of liquid–crystal displays (LCDs) without the need of a photometric measurement device was described by Xiao et al. (2011) [1]. It relies on observer’s judgments of visual luminance by presenting eight half-tone patterns with luminances from 1/9 to 8/9 of the maximum value of each colour channel. These half-tone patterns were distributed over the screen both over the vertical and horizontal viewing axes. We conducted a series of photometric and psychophysical measurements (consisting in the simultaneous presentation of half-tone patterns in each trial) to evaluate whether the angular dependency of the light generated by three different LCD technologies would bias the results of these gamma transfer function estimations. Our results show that there are significant differences between the gamma transfer functions measured and produced by observers at different viewing angles. We suggest appropriate modifications to the Xiao et al. paradigm to counterbalance these artefacts which also have the advantage of shortening the amount of time spent in collecting the psychophysical measurements. Display calibration Psychophysics Perceptual Visual gamma correction Luminance matching Observer-based calibration CIC; DAG; 600.052; 600.077; 600.074 exported from refbase (http://refbase.cvc.uab.es/show.php?record=2511), last updated on Tue, 14 Jul 2015 10:53:35 +0200 text http://www.sciencedirect.com/science/article/pii/S0141938214000493 http://refbase.cvc.uab.es/files/PRK2014.pdf http://www.sciencedirect.com/science/article/pii/S0141938214000493 10.1016/j.displa.2014.07.001 Admin @ si @ PRK2014 2014 continuing periodical academic journal 35 5 227–239