a method to generate PNG cutouts of the host #336

Job	Run time
codestyle	10s
Python-3.9, deps=current	1m 16s
Python-3.9, deps=numpy122	1m 20s
Python-3.9, deps=astropydev	1m 26s
Python-3.9, deps=numpydev	1m 33s
Python-3.9, deps=astropydev-numpydev	1m 32s
Python-3.10, deps=current	1m 14s
Python-3.10, deps=numpy122	1m 20s
Python-3.10, deps=astropydev	1m 28s
Python-3.10, deps=numpydev	1m 31s
Python-3.10, deps=astropydev-numpydev	1m 32s
	14m 22s

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