RMS contrasts a) and RMS errors b) from synthetic image deconvolution experiment, both in percent of the mean intensity. Black circles (○, in a only): Synthetic “true” images. Blue symbols: monochromatic images convolved with S₀ and then summed. The crosses (× ) correspond to those images and the pluses (+ ) to the same images after deconvolution with S₀. Green symbols: monochromatic images convolved with S_mono(λ,θ). The crosses (× ) correspond to those images and the pluses (+ ) to the same images after deconvolution with S₀. The squares (□) correspond to those summed images again, but now deconvolved with S₀·S_tilt(θ). Red symbols: convolved images like for the green symbols but with three types of imperfections in the deconvolution. Up triangles (△ ): transmission phase not used for calculating S_tilt. Down triangles (▽ ): deconvolve with the MTF, S₀·|S_tilt(θ)|. Diamonds (◇): deconvolution with S₀·S_tilt(θ) mirrored in the x direction.