Operation Manual

Working with bitmaps | 529
Correction of a color cast. The image on the right is the corrected version.
Adjusting brightness and contrast across an entire image
You can brighten, darken, or improve the contrast in an entire image by using the following controls:
• Brightness slider — lets you brighten or darken an entire image. This control can correct exposure problems caused by too much light
(overexposure) or too little light (underexposure) at the time the photo was taken. If you want to lighten or darken specific areas of
an image, you can use the Highlights, Shadows, and Midtones sliders. Adjustment made by the Brightness slider is nonlinear, so the
current white point and black point values are not affected.
• Contrast slider — increases or decreases the difference in tone between the dark and light areas of an image. Moving the slider to the
right makes the light areas lighter and the dark areas darker. For example, if the image has a dull, gray tone, you can sharpen the detail
by increasing the contrast.
Adjusting the brightness and contrast of an image can reveal more image detail.
Adjusting highlights, shadows, and midtones
You can brighten or darken specific areas of an image. In many cases, the position or strength of the lighting at the time a photo is taken
causes some areas to appear too dark and other areas to appear too light.
• Highlights slider — lets you adjust brightness in the lightest areas of an image. For example, if you take a photo with a flash, and the
flash washes out the foreground subjects, you can move the Highlights slider to the left to darken the washed-out areas of the image.
You can use the Highlights slider in conjunction with the Shadows and Midtones sliders to balance the lighting.
• Shadows slider — lets you adjust the brightness in the darkest areas of an image. For example, a bright light behind a photo subject
(backlighting) at the time a photo is taken can cause the subject to appear in shadow. You can correct the photo by moving the Shadow
slider to the right to lighten the dark areas and reveal more detail. You can use the Shadows slider in conjunction with the Highlights
and Midtones sliders to balance the lighting.
• Midtones slider — lets you adjust the brightness of the midrange tones in an image. After adjusting the highlights and shadows, you
can use the Midtones slider to fine-tune the image.
The Highlights and Shadows sliders can lighten or darken specific areas of an image.
Using the histogram
The histogram lets you view the tonal range of an image to evaluate and adjust the color and tone. For example, a histogram can help you
detect hidden detail in a photo that is too dark because of underexposure (a photo taken with insufficient light).