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Preliminary implementation of GridFieldVaryingPSF for convolving FOVs with field-varying PSFs using interpolation. The implementation might look somewhat convoluted, and it does not rely on many existing Numpy and SciPy methods, but this is done purposely to enable Numba compilation and parallelization. Missing: - Defining the structure of the input PSF grid; - Reading PSF grid coordinates and perform correct positioning of the PSF; - Kernel normalization; - Expand for multiple wavelengths.
Release candidate of PSF effect using a grid of PSFs that are interpolated across the field. Working example, but further testing required. No multiple-wavelength compatibility yet. - Compatibility with 3.5 lost (uses f-strings). Though these seem to be used in other places, so it probably was lost before. - Some docstring incomplete, mostly due to obfuscated attributes or missing or not well-defined type hints.
Raising exceptions for pixels out of bounds during numba routines wasn't working, so it was removed and made it compulsory that the coordinates to be computed lie withing the PSF grid.
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Replacing #208, because we still want to add a field varying PSF