UGC NET CSE | June 2019 | Part 2 | Question: 27

Question

Consider a raster system with resolution $640$ by $480$. What size is frame buffer (in bytes) for this system to store $12$ bits per pixel?

• A. $450$ kilobytes
• B. $500$ kilobytes
• C. $350$ kilobytes
• D. $400$ kilobytes

Answer 1

Resolution = 640x480 =307200 pixels

no of bits per  pixel=12

 Frame buffer in bytes = (307200 x 12 ) / 8 =460800 =460.8 KB

 Option A 450 KB is nearest

Answer 2

 

Resolution = 640*480 pixels

No. of bits per pixel=12

Frame Buffer size = Resolution* No. of bits per pixel

                              =640*480*12 bits 

                              =(640*480*12) /8 Bytes                                 (1 bit = 1/8 Bytes) 

                              =(640*480*12) / (8 * 1024)  Kilo Bytes          (1 Bytes = 1/ 2^10 Kilo Bytes)

                              = 450 KB
  450 KB is the answer

So option A is correct