What is one common method for enhancing the contrast in microscope images?

Utilizing filters within the microscope is a well-established method for enhancing contrast in images. Filters can selectively absorb certain wavelengths of light while allowing others to pass through, which can significantly improve the visibility of the specimen details against the background. For instance, using a red filter while observing a specimen can enhance the contrast of certain cellular structures that are more visible under red light, making them easier to study and analyze.

In contrast, simply using different lens shapes primarily influences the magnification and resolution rather than directly affecting the contrast. Regularly cleaning objectives will help maintain clarity and reduce artifacts but will not fundamentally change the contrast of the images produced. Changing the power source might influence the light's intensity but does not specifically enhance contrast as filters do. Thus, the correct answer highlights a targeted approach to improving image quality in microscopy through the use of specialized filters.