Assertion: dark frame subtraction | /r/HasProperty | a best practice
Facets:
value: for astrophotography
type: PURPOSE
value: along with flat-field correction
type: OTHER
Source sentences:
text: Dark-frame subtraction is also used in digital photogrammetry, to improve the contrast of satellite and air photograms, and is considered a best practice, along with flat-field correction, for astrophotography.