This article explains how entropy measures an image's level of disorder or unpredictability and how it can be used in various practical applications such as image compression, segmentation, and quality assessment. The article provides step-by-step instructions on calculating entropy in photos using popular Python libraries such as NumPy, OpenCV, and SciPy. Through the use of entropy, it is possible to measure a picture's complexity and identify the most informative regions for further processing or analysis.