Left panels: color-scale representation of 1.5′× 1.5′ postage-stamp images extracted from the SDSS g-band data (in counts), centered on two CALIFA targets (UGC 00312 and NGC 7716), together with a set of ellipses (solid-black lines) representing the recovered shape at different isophotal intensity levels by the analysis described in the text. The last dashed red-black ellipse represents the 1σ isophotal intensity level over the background, adopting the median ellipticity and position angle to plot it. Right panels: surface brightness profiles derived for the considered galaxies on the basis of the corresponding isophotal analysis (gray solid circles), together with the best fit to an exponential profile for the portion of the surface brightness dominated by the disk (gray dashed line). For NGC 7716 a previous iteration of the fitting procedure is shown, before the rejection of those values dominated by the bulge (solid-line).