Image processing involves processing images in a desired manner by obtaining an image in a readable format from sources like the Internet. The digital image can then be optimized for the intended application by enhancing or altering structures within it based on factors like the body part, diagnostic task, or viewing preferences. Some examples of image processing include enhancing images to make them more useful or pleasing, restoring images by removing things like blurriness or grid lines, and decompressing compressed image data or reconstructing image slices from scans.