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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?

  1. $450$ kilobytes
  2. $500$ kilobytes
  3. $350$ kilobytes
  4. $400$ kilobytes
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2 Answers

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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
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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

Answer:

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