Schematic of SDI (including the FOV loss through scaling). First, the images (A_λ) are scaled inversely proportional to their wavelength (B_λ). A stellar PSF model (C) is then created using PCA analysis. Afterwards the stellar PSF model (C) is rescaled for each wavelength channel proportional to its wavelength (D_λ) to have the same scaling as the original images (A_λ). Therefore, the outer region of the small wavelength images is not covered by the scaled stellar PSF models (D_λ). This reduces the FOV by a factor R = λ_min/λ_max. The reduced FOV is marked by a red border, the companion is marked as a red dot.