Method and apparatus for blending images

摘要

A method and apparatus for blending first and second images stored in respective first and second VRAM buffers for production of a combined image on a computer display screen. The method includes storing a first image to be blended in a first VRAM buffer and storing a second image to be blended in a second VRAM buffer. The blending mechanism includes the process of loading the respective VRAM buffers with component 4 bit contributions of information representing first and second gray levels or color tones pixelwise representative of corresponding pixel portions of the respective first and second images to be combined. The output of the VRAM buffers combines these contributions of the respective first and second images to produce an address to a look-up table which produces at that particular address location a blended gray level or color tone representative of a blending of the two gray levels or color tones. This combines the first video data and the second video data to produce a blended image on the computer display screen.