1.
original picture; original artwork
The original painting, drawing, or artwork from which reproductions are made.
2.
key animation frame; key drawing
In anime production, the main drawings that define the start and end points of a movement, from which in-between frames are created.
Composed of 原 (original) + 画 (picture/drawing). Has two distinct domains of use.
SENSE 1 — ART:
The original painting or drawing from which reproductions are made.
SENSE 2 — ANIME/ANIMATION:
Key frames that define the start and end points of a movement.
- 原画マン: key animator (well-known job title)
- 原画 → 動画: key frames → in-between frames (standard workflow)
- 作画: drawing/animation work (broader term)