Tkačik, Gašper Garrigan, Patrick Ratliff, Charles Milčinski, Grega M. Klein, Jennifer H. Seyfarth, Lucia Sterling, Peter H. Brainard, David Balasubramanian, Vijay Linearity of the camera in ISO setting. <p>The mean raw RGB response of the three color channels (red, green, blue; shown in corresponding colors) is plotted against the ISO setting after dark subtraction, for two values of exposure time (solid line, circles = ; dashed line, squares = ), and aperture. The lines are linear regressions through non-saturated data points (solid squares or circles; raw dark subtracted values between 50 and 16100); the slopes are 0.99 (R), 0.98 (G), 0.99 (B) for exposure and 1.03, 1.02, 1.04 for exposure. The camera saturated in the red channel at longer exposure; the corresponding data points (empty red circles) are not included into the linear fit.</p> iso 2013-02-20
    https://plos.figshare.com/articles/figure/_Linearity_of_the_camera_in_ISO_setting_/435582
10.1371/journal.pone.0020409.g007