halation
/heɪˈleɪʃən/
noun
- A blurring or spreading of light around bright areas in a photograph or image, caused by reflection or scattering.
- The old camera produced a soft halation around streetlights at night.
- Halation can be reduced by using a lens hood or anti-reflective coating.
- Photographers sometimes use halation to create a dreamy effect in portraits.