Dynamic range and spatial scales in a solar EUV image. Left: fifteen-bit image taken by the Full Sun Imager (FSI) channel of EUI at 17.4 nm on 2022 March 17 at 06:00:45 UT, displayed in linear scale. Only the brightest features are visible. The profile is taken along the row marked by the side ticks. Middle: same image after logarithmic scaling. Faint off-limb details are revealed, but the local contrast is diminished. Right: Fourier power spectrum of the variance normalized image. The profile is that of the bottom row. The larger the spatial scale, the more power (and thus variability) in the image.