Be aware of overprocessing. The process of emphasizing a small range of pixel values by concentrating the visible contrast. In this activity, students concentrate the visible contrast by using the Contrast and Brightness scales. This activity introduces the fundamental notion of resolution. It is possible that students may ask questions about this concept.
Resolution refers to the discernibility or clarity of objects in an image.
Resolution is a function of the distance of the camera from the objects being imaged and characteristics of the camera itself. Imagine sitting in a football stadium, looking for a friend. Now let's assume you can walk directly across the field toward her. As you approach her, the absolute field of view of each rod or cone becomes smaller, and details become clearer. The same thing is happening with the images provided in this activity.