Relation between photometric component fractions derived with and without PSF convolution in edge-on synthetic images. Each point represents a Sombrero-like galaxy. Circles, triangles, and squares correspond to the ratio of photometrically measured bulges (f_bulge,p), disks (f_disk,p), and stellar halos (f_halo,p), respectively. The blue solid line denotes the ideal 1:1 correspondence, while the dashed lines indicate a ±0.1 deviation range.