This chapter is from the book
- What does resolution mean?
- How can you use the Crop tool when retouching photos?
- How can you adjust the tonal range of an image?
- What is saturation, and how can you adjust it?
- Why would you use the Unsharp Mask filter on a photo?
- 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, which
is 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.