Graphics Programs Reference
In-Depth Information
Keep an eye on your Histogram panel. Simply doing normal corrections to an image
can break up a histogram, giving you an image that starts to look posterized (when
a region of an image with a continuous gradation of tone is replaced with several
regions of fewer tones). Avoid breaking up the histogram by learning to use multi-
function tools, like the Curves panel, and making changes using adjustment layers,
that don't change your original image data.
2
To make sure that the values you read in Photoshop are accurate, select the
Eyedropper tool ( ). Notice that the Options bar (across the top of the document
window) changes to of er options specii c to the Eyedropper tool. Click and hold
on the Sample Size drop-down menu and choose 3 by 3 Average. This ensures a
representative sample of an area, rather than the value of a single screen pixel.
Set up the Eyedropper tool to sample more pixel
information.
Making the Curve adjustment
You will now address the tonal values of this image. To do this, you will take advantage of
the Curves Adjustments panel. Adjustment layers can be created by using the Adjustments
panel, or in the Layers panel. To help you see the relationship between Adjustment layers
and other layers, you will create one using the Layers panel.
1
If the Layers panel is not visible, choose Window > Layers. In this example you will
use an Adjustment layer to make color corrections to this image. By using adjustments,
you can make changes to an image's tonal values without destroying the original
image data. See Chapter 9, “Taking Layers to the Max,” for more information about
how to use the Adjustments panel. Leave the Curves Adjustments panel open for the
next section.
 
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