Comparison of the mean JWST background due to crowding (as measured from artificial stars) and the crowding noise (measured from the dispersion of artificial stars). The two quantities are closely related as they are both measures of the stellar background. Several regions in NGC 3447 are shown including the tidal host (“perfect host”), which is very similar to the “blank sky” measured from the opposite (host-free) NIRCam module. The inset plots the crowding level vs. the residual of each hosted SN from the distance-ladder fit of R22. We find no correlation between these quantities and thus no evidence for an uncorrected bias in HST photometry with crowding.