中等ICT-MULT-007
An uncompressed bitmap is 640 by 480 pixels with 24-bit colour. Its size is:
A. 921600 bytes.✓ 答案
B. 921600 bits.
C. 307200 bytes.
D. 640 bytes.
解說
640 × 480 × 24 / 8 = 921600 bytes. 307200 is the number of pixels. 921600 bits would forget that the 24 already counts bits and that the answer must still be divided by 8.