拡大

1. Origins, structure, and basic meaning

• Structure: 拡大, read かくだい, means becoming larger in size or scope, or making something larger.
• Basic usage: It covers both enlarging a photograph and damage spreading over a wider area.

2. Common pitfalls and similar expressions

• Usage compared with 拡張
  • 写真を拡大 describes making a photograph larger. For extending functionality or scope, as in 機能を拡張, 拡張 is often used.