With a colour depth of 6 bits per pixel, how many distinct colours are possible?

• A. 128
• B. 32
• C. 256
• D. 64

Answer: (D)

A colour depth of 6 bits per pixel means each pixel can be encoded using 6 binary choices, so the total number of distinct colour values is 2^6. Since 2^6 equals 64, there are 64 possible colours. More bits give more colours (five bits would be 32, seven bits would be 128, eight bits would be 256, and so on).