How much memory is required to retain picture data for one screen if the resolution is 800 x 600 if an RGB display device uses 8 bit per pixel, per color scheme. How much memory is required to keep picture data for one second if the refresh rate is 50Hz?
Total number of pixel = Screen resolution = 800 x 600 = 4, 80, 000 pixels Each pixel takes 8 bit to represent the color, so total number of bits required to store display information = 4, 80, 000 x 8 = 38, 40, 000 bits Size of frame buffer in Byte = 38, 40, 000 / 8 = 4, 80, 000 Bytes Size of frame buffer in KB = 4, 80, 000 / 1024 = 468.75 KB Size of frame buffer in MB = 468.75 / 1024 = 0.46 MB To store the picture information of resolution 800 ´ 600 pixels having 8 bit per pixel, 0.46 MB memory is required. Refresh rate is 50 Hz, so it paints the screen 50 times in a second. On every cycle, new data is loaded in same buffer. So, size of frame buffer do not alter, it is just reloaded 50 times in a second.
