1 チャンネルあたり 8 ビットで構成されたアルファチャンネルを持つカラーのテクスチャ形式
BGRA32 format is used by WebCamTexture on some platforms. Each of RGBA color channels is stored as an 8-bit value in [0..1] range. In memory, the channel data is ordered this way: B, G, R, A bytes one after another.
関連項目: Texture2D.format, texture assets.