Certified Professional Photographer (CPP) Practice Exam 2026 - Free CPP Practice Questions and Study Guide

The term that describes the number of pixels per inch in an image is resolution. Resolution is a critical factor in determining the quality and clarity of an image; it indicates how much detail the image holds. A higher resolution means more pixels are packed into each inch, resulting in a sharper and more detailed image, which is especially important for prints and professional photography.

Aspect ratio refers to the proportional relationship between an image's width and its height, influencing the overall shape but not the level of detail. Compression involves reducing the file size of an image, which may involve losing some quality or detail but doesn't inherently describe how many pixels exist in an inch. Bit depth pertains to the amount of color information in each pixel, affecting the range of colors in the image rather than its resolution. Therefore, when considering the number of pixels per inch, resolution is the term that accurately describes this concept.