Comparison of different post-processing techniques on the IRDIS H3 images from 2017. The first three figures are obtained in ADI, the fourth in RDI (see Sect. 2). The strong quasi-centrosymmetric signal is the stellar continuum residual. The jet morphology discussed in Sect. 4.2.1 looks reasonably similar (see the white line encircling the inner spot) and all the features that we discussed in the text are always present (with the possible exception of the left bend in the PCA image). Images are rotated by 65° counterclockwise. The color scale is logarithmic and relatively arbitrary.