Which term describes the number of pixels per inch in images?

• A. Colour depth
• B. Resolution in images
• C. Sample rate
• D. Data compression

Answer: (B)

The main idea is how many pixels fit into each inch of an image, which is called resolution. It describes the density of pixels, so higher resolution (more pixels per inch) gives more detail when you view or print the image. For instance, at 300 pixels per inch, there are 300 pixels in every inch, so a 4x6 inch print would need about 1200x1800 pixels. Colour depth describes how many colors each pixel can show, not how many pixels fit into an inch. Sample rate relates to how often a signal is measured over time, not spatial density in images. Data compression reduces file size, not the pixel density.