An observation apparatus (1) for enhancing the observation of an object (2) includes an output color image projector (8) for projecting a time sequence (31) of output color images (32) onto a projection area (40) on the object (2). The projector (8) has an output spectrum (60) including, at least in the visible-light range, a set of output spectral bands (60). The apparatus (1) further includes a multispectral camera system (4) for capturing a time sequence (21) of input color images (22) from the projection area (40) in at least two input spectral bands (42) different from the output spectral bands (62). The apparatus (1) is configured to derive the output color images (32) from the input color images (22) and project the output color images (32) onto the projection area (40) in real time. Because the input spectral bands differ from the output spectral bands, the output color images (32) can be processed to deviate arbitrarily from the input color images (22) without impacting operation of the camera system (4).
