If you increase the resolution of an image while keeping colour depth constant, what happens to the file size?

If you increase the resolution of an image while keeping colour depth constant, what happens to the file size?

• A. It decreases
• B. It stays the same
• C. It increases
• D. It becomes unpredictable

Answer: (C)

Increasing resolution means more pixels in the image. If colour depth stays the same, each pixel uses the same number of bits, so total data equals (number of pixels) times (bits per pixel). Doubling the pixel count doubles the data, so the file size grows. Compression or encoding nuances can tweak the exact size, but the basic relationship is that higher resolution with constant colour depth increases the file size.

Increasing resolution means more pixels in the image. If colour depth stays the same, each pixel uses the same number of bits, so total data equals (number of pixels) times (bits per pixel). Doubling the pixel count doubles the data, so the file size grows. Compression or encoding nuances can tweak the exact size, but the basic relationship is that higher resolution with constant colour depth increases the file size.