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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WSfd1234e1c4b69f30ea53e41001031ab64-76c2a.html" title="About masks and alpha channels"><img src="images/blank.gif" alt="Previous" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WSfd1234e1c4b69f30ea53e41001031ab64-76c0a.html" title="Change Quick Mask options"><img src="images/blank.gif" alt="Next" width="17" height="17" /></a></li></ul><div class="hierarchy" id="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-7701a.html">Selecting and masking</a> /
     <a href="WSfd1234e1c4b69f30ea53e41001031ab64-76c3a.html"><b>Saving selections and using masks</b></a> 
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                <h1>
                    Create a temporary quick mask
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                <div><div class="section"><p>To use Quick Mask mode, start with a selection
and then add to or subtract from it to make the mask. You can also
create the mask entirely in Quick Mask mode. Color differentiates
the protected and unprotected areas. When you leave Quick Mask mode,
the unprotected areas become a selection.</p>
<div class="note"><span class="notetitle">Note:  </span>A temporary Quick Mask channel
appears in the Channels panel while you work in Quick Mask mode.
However, you do all mask editing in the image window.</div>
</div>
<ol><li class="stepexpand"><span>Using any selection tool, select the part of the
image you want to change.</span></li>
<li class="stepexpand"><span>Click the Quick Mask mode button&#160;<img src="images/P_QuickMaskMode_Lg_N.png" /> in
the toolbox.</span> <p>A color overlay (similar to a rubylith) covers and protects
the area outside the selection. Selected areas are left unprotected
by this mask. By default, Quick Mask mode colors the protected area
using a red, 50% opaque overlay.</p>
<div class="fignone"><img alt="" id="se_15" src="images/se_15.png" /><div class="figdesc">Selecting in Standard mode and Quick Mask mode </div><br /><dl><dt class="dlterm">A.</dt>
<dd>Standard mode</dd><p class="dlseparator"></p><dt class="dlterm">B.</dt>
<dd>Quick
Mask mode</dd><p class="dlseparator"></p><dt class="dlterm">C.</dt>
<dd>Selected pixels appear
as white in channel thumbnail</dd><p class="dlseparator"></p><dt class="dlterm">D.</dt>
<dd>Rubylith
overlay protects area outside selection, and unselected pixels appear
as black in channel thumbnail</dd><p class="dlseparator"></p></dl>
</div></li>
<li class="stepexpand"><span>To edit the mask, select a painting tool from the toolbox.
The swatches in the toolbox automatically become black and white. </span></li>
<li class="stepexpand"><span>Paint
with white to select more of an image (the color overlay is removed
from areas painted with white). To deselect areas, paint over them
with black (the color overlay covers areas painted with black).
Painting with gray or another color creates a semitransparent area,
useful for feathering or anti-aliased effects. (Semitransparent
areas may not appear to be selected when you exit Quick Mask Mode,
but they are.)</span> <div class="fignone"><img alt="" id="se_16" src="images/se_16.png" /><div class="figdesc">Painting in Quick Mask mode </div><br /><dl><dt class="dlterm">A.</dt>
<dd>Original selection and Quick Mask mode with green chosen
as mask color</dd><p class="dlseparator"></p><dt class="dlterm">B.</dt>
<dd>Painting with white
in Quick Mask mode adds to the selection</dd><p class="dlseparator"></p><dt class="dlterm">C.</dt>
<dd>Painting
with black in Quick Mask mode subtracts from the selection</dd><p class="dlseparator"></p></dl>
</div></li>
<li class="stepexpand"><span>Click the Standard Mode button&#160;<img src="images/P_StandardMaskMode_Lg_N.png" /> in
the toolbox to turn off the quick mask and return to your original
image. A selection border now surrounds the unprotected area of
the quick mask.</span> <p>If a feathered mask is converted to a selection, the boundary
line runs halfway between the black pixels and the white pixels
of the mask gradient. The selection boundary indicates the transition
between pixels that are less than 50% selected and those that are
more than 50% selected.</p>
</li>
<li class="stepexpand"><span>Apply the desired changes to the image. Changes affect
only the selected area.</span></li>
<li class="stepexpand"><span>Choose Select&#160;&gt; Deselect to deselect the
selection, or save the selection by choosing Select&#160;&gt;
Save Selection. </span> <div class="tip"><img src="images/tip_help.png" />You can convert this temporary mask to
a permanent alpha channel by switching to standard mode and choosing
Select&#160;&gt; Save Selection.</div></li>
</ol>
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