Correcting Tone and Exposure - Beginning Photo Retouching and Restoration Using GIMP - page 60

4. Move the middle (gamma) slider slightly toward the left, to bring out the detail

(the value should be about 1.50). Move the white slider to the left, to the point
where the image data begins (Figure 3-30 ).

Figure 3-30. Revealing detail by adjusting the midpoint slider

The result is an image that is brighter, more detailed, and less harsh than before—a more accurate
portrayal of this scene on a bright, sunny mid-afternoon (Figure 3-31 ).

Figure 3-31. Before and after comparison

Tonal Corrections Using Curves
The Curves dialog box (Figure 3-32 ) allows you to shift the brightest, mid-tone, and darkest pixels in the
image you are working with. As with Levels, this allows you to make an image lighter or darker or to change
the contrast and color.