Quality of the NISP imaging channel. Shown is a 3′.0 × 3′.0 wide area in the self-calibration field. The depth corresponds to that of the Euclid Deep Survey, that is about 26.3 AB mag for 5σ point sources, achieved in 3.7 h integration time per filter. For this composite we mapped the H_E, J_E, and Y_E-passbands to RGB colour channels. (Near) saturated stars appear with characteristic spikes and diffraction rings differing in size as a function of wavelength. The Euclid Deep Survey will in total cover about 53 deg², more than 20 000× the area shown here.