Adjusting Sharpness and Noise 85
The Temperature and Tint sliders take on the values that you copied,
and the photo becomes less orange.
7 In the toolbar at the bottom right of the viewing area, click the right arrow.
You’ll use photo DSC_8718 again for the final exercise with the Adjust pane.
Adjusting Sharpness and Noise
Even a modern digital camera with sophisticated state-of-the-art autofo-
cus technology can produce a blurry photo if you move the camera slightly
when you snap the shutter. And photos taken in low light can show digital
noise when you pump up their exposure using the Adjust pane’s Exposure or
Shadows sliders.
You can’t completely eliminate these problems with photo editing tools, but
you can mitigate them with the Sharpness and De-noise sliders.
The Sharpness tool analyzes the color and brightness values of pixels near
each other in a photo, and when there is a substantial difference, it emphasizes
them. The result is that the edges in a photo appear sharper. The De-noise tool
analyzes the color and brightness values of neighboring pixels and reduces the
differences between them. The result is that noisy speckles in a photo appear
blurred, becoming less obvious.
86 Reviewing and Improving Your Photos
Rather than attempt to improve a photo with these tools, the effects of which are
subtle, you’ll take a close look at a highly textured portion of photo DSC_8718,
which should still be open in the viewing area, to see how these tools work.
1 In the toolbar, drag the size slider all the way to the right, and then use the
Navigation window to position the view so that you can see the sawed-off
edge of the board nailed to the tree.
You’ll adjust the sliders to control the appearance of the wood grain in
the board.
2 Drag the Sharpness slider all the way to the right.
The grain in the wood becomes more pronounced as the Sharpness tool
amplifies the differences between nearby pixels.
3 Drag the Sharpness slider all the way back to the left, and then drag the
De-noise slider all the way to the right.
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