很久很久以前，剛學習windows編程時，碰到BMP圖像的數據結構，裏面就有Plane的概念，當時搞了很長時間也沒有建立很形象化的理解。這幾天看FFMPEG，恰好學習YUV格式時瀏覽到了一個網頁，我覺得講的特別好，言簡意賅，讓我豁然開朗。好的概念就是這樣，又精準又形象：
YUV formats fall into two distinct groups, the packed formats where Y, U (Cb) and V (Cr) samples are packed together into macropixels which are stored in a single array, and the planar formats where each component is stored as a separate array, the final image being a fusing of the three separate planes.