also: プロマイド
celebrity photo card; postcard-sized portrait
Refers specifically to a postcard-sized photographic portrait of a celebrity, often sold as a collectible. This is the primary modern meaning.
She collects idol photo cards.
Only with reading ブロマイド
Photographic paper coated with a silver bromide emulsion. This is the original technical meaning, now less common in everyday language.
Print onto bromide paper in the darkroom.
I bought a photo card of my favorite idol.
When I was a kid, I used to collect idol photo cards.
They sell photo cards in the theater lobby.