- The term resolution refers to the number of pixels that describe an image and establish its detail. The three different types are image resolution, monitor resolution—both of which are measured in pixels per inch (ppi)—and printer or output resolution, measured in ink dots per inch (dpi).
- You can use the Crop tool to trim, scale, and straighten an image.
- You can use the black, white, and gray triangles below the Levels command histogram to control the midpoint and where the darkest and lightest points in the image begin, thus extending its tonal range.
- Saturation is the strength or purity of color in an image. You can use the Sponge tool to increase the saturation in a specific area of an image.
- The Unsharp Mask filter adjusts the contrast of the edge detail and creates the illusion of a more focused image.