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                <h1>
                    Work with backdrops
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                <div><div class="section"><p>You can choose to show only the active layer
in the preview image, or you can show additional layers in the preview
image as a backdrop. Using the Mode options, you can position the
backdrop in front of or behind the active layer to keep track of
your changes, or to line up a distortion with another distortion made
in a different layer.</p>
<div class="important"><span class="importanttitle">Important:  </span>Only the active
layer is distorted, even if other layers are displayed. </div>
<dl><dt class="dlterm">Showing the backdrop</dt>
<dd>Select Show Backdrop, and then choose an option from the
Use pop‑up menu. If you use All Layers, changes to the current target layer
are not reflected in the backdrop layer. Specify an overlay opacity
to change the blending between the target layer and the backdrop.
The mode determines how the backdrop and the target layer are combined
for the preview. Choose an option from the Mode pop‑up menu.</dd><p class="dlseparator"></p><dt class="dlterm">Hiding the backdrop</dt>
<dd>Deselect Show Backdrop in the View Options area of the dialog
box.</dd><p class="dlseparator"></p></dl>
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