RGB {psyphy}

Luminance Calibration Data from Video Projector

Description

The data were obtained from the measurements of the luminance of the R, G and B channels individually, as well as the three together, W, for each of 21 grey levels, GL from a screen on which a video projector was displaying an image of a uniform field. Grey level has been normalized to the interval [0, 1], though originally it is specified as integers in [0, 255]. The measurements were obtained with a Photo Research 650 spectro-radiometer.

Usage

data(RGB)

Format

A data frame with 84 observations on the following 3 variables.

Lum

numeric vector of the measured luminance in candelas/meter^2

GL

The grey level normalized to the interval [0, 1]

Gun

factor with levels R G B W

Examples

data(RGB)