A compressing/decompressing apparatus comprising a receiver, a memory interface, a compressor and a decompressor is disclosed. The receiver receives a video graphics signal comprising a plurality of video graphics packets, each comprising a plurality of pixels. The memory interface is coupled between the frame buffer memory and the compressing and decompressing device as a data transfer interface. The compressor sequentially receives a video graphics packet of the video graphics signal, truncates a predetermined length of LSBs of each pixel in the video graphics packet to form a compressed video graphics signal comprising of a plurality of compressed video graphics packets, and stores the compressed video graphics signal in a frame buffer memory. The decompressor sequentially receives a compressed video graphics packet of the compressed video graphics signal, recovers each pixel of the compressed video graphics packet with an adjusted value of the predetermined length to form a decompressed video graphics signal comprising of a plurality of decompressed video graphics packets.