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Imatest Documentation f-stops (EV). The most popular units for expressing dyamic range. Density units: Based on a log10 scale. 1 density unit = 3.32 f-stops (EV). X-axis alignment Unshifted Shifted (aligned) Of greatest interest: shows total exposure range The image below shows log pixel level vs. (log) exposure (in f-stops). The x-axis has been shifted (aligned). Unaligned log pixel levels are shown as faint lines on the right of the plot. The camera has a strong "shoulder," which reduces the likelihood of highlight burnout. Log pixel level as a function of (log) exposure. Canon EOS-20D, ISO 100, Standard picture mode. Dynamic range results are shown on the upper right. Dynamic range numbers based on f-stop noise are shown boldface. These are identical to the numbers in the Stepchart analysis. An alternative dynamic range measurement based on pixel SNR is shown in normal (not bold) typeface. Two additional plots are shown below. The number of detected patches for each file is shown to the right of the file name ( N 20 20 17 10 ). 286 of 451
Imatest Documentation Dynamic range — background f-stop noise, showing dynamic ranges Pixel SNR in dB (20 log10(Pixel level/noise)), showing dynamic ranges Dynamic range (DR) is the range of tones over which a camera responds. It is usually measured in f-stops, or equivalently, zones or EV, all of which represent factors of two in exposure. (It can also be measured in density units, where one density unit = 3.322 f-stops.) DR is typically specified as the range of tones over which the RMS noise, measured in f-stops (the inverse of the signal-to-noise ratio, SNR), remains under a specified maximum value. The lower the maximum noise (the higher the minimum SNR), the better the image quality, but the smaller the corresponding dynamic range. SNR tends to be worst in the darkest regions. Imatest calculates the dynamic range for several maximum RMS noise levels, from 0.1 f-stop (high image quality; SNR = 10) to 1 f-stop (low quality; SNR = 1). 287 of 451
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