Which statement is true about colour depth?

Which statement is true about colour depth?

• A. The physical size of the image
• B. The number of pixels in the image
• C. The brightness of the image
• D. The number of colours that can be displayed per pixel

Answer: (D)

Colour depth is how much color information a pixel can hold. The more bits per pixel, the more distinct colors can be represented, so the idea that colour depth is about the number of colours that can be displayed per pixel is the best description. For example, 24-bit colour uses 8 bits for each RGB channel, giving about 16.7 million possible colors per pixel. This is separate from how big the image is (which depends on resolution) or how bright the image appears (which relates to luminance).

Colour depth is how much color information a pixel can hold. The more bits per pixel, the more distinct colors can be represented, so the idea that colour depth is about the number of colours that can be displayed per pixel is the best description. For example, 24-bit colour uses 8 bits for each RGB channel, giving about 16.7 million possible colors per pixel. This is separate from how big the image is (which depends on resolution) or how bright the image appears (which relates to luminance).