noun
original picture; original artwork
Refers to the original physical or digital artwork, as opposed to reproductions, prints, or copies. Common in art and publishing contexts.
この展覧会では、有名な絵本の原画が展示されている。
Original artwork from a famous picture book is on display at this exhibition.
noun
key frame; key animation
In animation, refers to the main drawings that define the start and end of a movement, drawn by senior animators. Contrasts with 動画 (douga, in-between frames).
アニメ制作では、まず原画を描いてから動画を追加する。
In anime production, key frames are drawn first, and then in-between frames are added.