Why Lena images are prferred for test purpose in DIP?

Lena images are often used in digital image processing (DIP) as a standard test image due to their rich texture and variety of features, which allow for effective testing and demonstration of image processing algorithms. The image contains a range of tones and details, making it suitable for evaluating different techniques such as compression, filtering, and edge detection. Additionally, its widespread use has established a common reference point for researchers and practitioners in the field. However, it's worth noting that the use of Lena has faced criticism regarding its origins and the considerations of ethical representation in imagery.