Graphics Programs Reference
In-Depth Information
5
Now, select the highlight slider ( ), and then hold down Alt (Windows) or Option
(Mac OS) and slide it to the right. Notice that the image appears posterized: this
is the automatic clipping that is visible when you hold down the Alt/Option key.
The clipping makes it easier to locate the darkest and lightest areas of an imageā€”an
essential task if you are trying to improve an image's tonal values.
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In this example, the l ames in the baseball hat are visible in the preview indicating that
that area is recognized as one of the lightest parts of this image. If you are working
on your own image and don't immediately see the lightest part of the image you can
Alt/Option drag until a light part of your image is highlighted. Notice that there are
other light areas in this image, but you are focusing on the primary subject, which is
the boy.
Select the highlight slider.
Hold down the Alt/Option key while
positioning the cursor over the image.
If you are working on a dif erent image you might notice that there are some other light
areas that appear that would be considered specular highlights. It helps to remember
that if a light point appears that belongs to something shiny, that you should ignore
it and drag the slider to the right until you i nd the i rst legitimate (non-specular)
highlight.
In the next step, you will simply mark this light area with a color sampler on the
image. This way, you can refer back to it at a later time.
 
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