Examples of simulated images of GALEX, LSST, and Euclid to which observational effects have been added, including spatial resampling (i.e. regridding), simulated noise, and convolution with the PSF of the corresponding cameras. The galaxies here are TNG501725 with O1 orientation index and TNG414917 with O4 orientation index. The original synthetic images are taken from the TNG50-SKIRT Atlas database and are generated from the TNG50 simulation using the SKIRT radiative transfer code. The variation in spatial resolution and depth can be seen in the images with GALEX images being the most blurred and shallowest, and I_E images being the sharpest and deepest. The pixel size difference is demonstrated with the red horizontal line (60″ long). The PSF FWHM and pixel size of the images are summarized in Table 1. The colour images are made from the composite of LSST g, r, and i images.