Computer Science for IGCSE & O level - Data Representation (Section 15 - No. 32)
A photograph is taken using a digital camera. If the number of pixels is doubled in both horizontal and vertical directions, how does the file size change (assuming the color depth remains the same)?
The file size is halved.
The file size doubles.
The file size quadruples.
The file size stays the same.
Förklaring
If both dimensions double, the total number of pixels (and thus the file size) increases by a factor of 2 * 2 = 4.