Color Correction and Restoration - Beginning Photo Retouching and Restoration Using GIMP - page 95

Figure 4-26. Cropping the borders, to achieve accurate Levels adjustments

3. Duplicate the background layer and rename it Color Correction (Figure 4-27 ).

Figure 4-27. Color correction edits will be made on a duplicate layer

4. Open the Levels dialog box (Image Menu ➤ Colors ➤ Levels). Because each

color channel has a different tonal value, we're going to make adjustments on
each one, to revive both contrast and color (Figure 4-28 ). In the Channels option,
select the Red color channel. Move the black point slider to the right, stopping
where the image data begins. Move the white point slider to the left, stopping
where the image data starts. (Wait until you adjust all three color channels before
clicking OK.)