terrain.png

terrain.png was a texture atlas found inside minecraft.jar. It was used to store the game's block and fluid textures, the block breaking animation, and some items. It has been superseded with minecraft_textures_atlas_.pngs, obtainable in the screenshots folder upon doing F3 + S in modern versions.

terrain.png is a fixed-width 256×256-pixel file that is split into different 16×16 squares which correspond to the texture for each block found in-game.

Before the introduction of texture packs, terrain.png had to be manually edited or replaced in order to change any textures found in-game. The file would have to be placed inside an edited minecraft.jar file in order to work.