Color Correction and Restoration - Beginning Photo Retouching and Restoration Using GIMP - page 106

Figure 4-47. A selection drawn around the damaged area

7. Open the Levels dialog (Image Menu ➤ Colors ➤ Levels). Select the Blue color

channel and move the black point slider to the right, where the image data
begins (Value setting around 36). Move the midpoint slider to the right (Value
setting around 0.88), until the colors in both parts of the image match as closely
as possible (Figure 4-48 ).

Figure 4-48. Adjusting the Blue channel brings the image into greater balance