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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<title>3.5. Quick Mask</title>
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<tr>
<th colspan="3" align="center" id="chaptername">3.5. Quick Mask</th>
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<td width="20%" align="left"><a accesskey="p" href="ch04s03s04.html">Prev</a> </td>
<th width="60%" align="center" id="sectionname">3.5. Quick Mask</th>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="gimp-qmask"></a>3.5. Quick Mask</h3>
</div>
</div>
</div>
<a id="id3335267" class="indexterm"></a>
<div class="mediaobject">
<img src="../images/dialogs/dialogs-channel-quickmask.png" />
</div>
<p>
A <span class="guilabel">Quick Mask</span> is a <a href="ch04s03s04.html" title="3.4. Selection masks">Selection Mask</a> intended to
be used temporarily to paint a selection. Temporarily means that,
unlike a normal selection mask, it will not be saved in the list
after its transformation to selection. The <a href="ch03s02.html" title="2. Selection Tools">selection tools</a> sometimes
show their limits when they have to be used for doing complex drawing
selection, as progressive. In this case, using the QuickMask is a
good idea which can give very good results.
</p>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3335193"></a>Activate Tool</h4>
</div>
</div>
</div>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
The QuickMask can be activated in the following order, from the
image-menu: <span class="guimenuitem"><span class="accel">S</span>elect/Toggle
<span class="accel">Q</span>uickMask</span>.
</p>
</li>
<li>
<p>
The QuickMask can also be activated by clicking the left-bottom
button showed in red on the screenshot.
</p>
</li>
<li>
<p>
It can also be activated by using <span><b class="keycap">Shift+Q</b></span>
shortcut.
</p>
</li>
</ul>
</div>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3335815"></a>Creating a Quick Mask</h4>
</div>
</div>
</div>
<p>
To initialize a <span class="guilabel">Quick Mask</span>, click the
bottom-left button in the image window. If a selection was active
in your image, then its content appears unchangedwhile the border
is covered by a tranlucent red color. If no selection was active
then all the image is covered by a tranlucent red color. At every
moment you can hide the maskby clicking on the eye icon <span class="guiicon">
<span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-eye.png" /></span>
</span> in front of the <span class="guilabel">QMask</span>.
From the channel dialog you can double click on the name or the
thumbnail to edit the <span class="guilabel">QMask</span> attributes. Then
you can changethe <span class="guilabel">Opacity</span> and its filling
color. Once a quick mask is initialized click on it to be sure
it is selected and blue highlighted in the list, and start to
paint on it with any Gimp paint tool. The mask is coded in gray
tones, so you must use white or gray to decrease the area limited
by the mask and black to increase it. The area painted in light
or dark gray will be transition areas for the selection like
feathering. When your mask is ready, click again on the
bottom-left button in the image window and the quick maskwill be
removed from the channel list and converted to aselection. Quick
mask's purpose is to paint a selection and its transitions with
the paint tools without worrying about managing selection masks.
It's a good way to isolate asubject in a picture because once the
selection is made you only have to remove its content (or inverse
if the subject is in the selection).
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3335135"></a>Using Quick Mask's</h4>
</div>
</div>
</div>
<div class="mediaobjectco">
<img src="../images/dialogs/dialogs-channel-masks-gradient.png" />
</div>
<div class="calloutlist">
<p class="title">
<b>Description</b>
</p>
<table border="0" summary="Callout list">
<tr>
<td width="5%" valign="top" align="left">
<img src="../images/callouts/1.png" alt="1" border="0" />
</td>
<td valign="top" align="left">
<p>
Screenshot of the image window with activated QuickMask. The
QuickMask is filled with a gradient from black (left) to
white (right).
</p>
</td>
</tr>
<tr>
<td width="5%" valign="top" align="left">
<img src="../images/callouts/2.png" alt="2" border="0" />
</td>
<td valign="top" align="left">
<p>
The QuickMask is now disabled and a selection is initialised
from the QuickMask, which was filled by a gradient before.
You see the selection borders in the middle of the image.
</p>
</td>
</tr>
<tr>
<td width="5%" valign="top" align="left">
<img src="../images/callouts/3.png" alt="3" border="0" />
</td>
<td valign="top" align="left">
<p>
A stroke is now added during the enabled selection. The key
is, that the black color will have no opacity of the
resulting stroke (right) and white color will have a full
opacity of the stroke (left).
</p>
</td>
</tr>
</table>
</div>
<p>
After the QuickMask Button is pressed, the command generates a
temporary 8-bit (0-255) channel, on which the progressive
selection work is stored. If a selection is already present the
mask is initialized with the content of the selection. Once
QuickMask has been activated, the image is covered by a red
semi-transparent veil. This one representes the non-selected
pixels. Any <a href="ch03s03.html" title="3. Brush Tools">paint tool</a>
can be used to create the selection on the QuickMask. They should
use only greyscale color, conforming the channel properties,
white enabling to define the future selected place. The
selection will be displayed as soon as the QuickMask will be
toggled but its temporary channel will not be available anymore.
</p>
<div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Tip">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Tip]" src="../images/tip.png" />
</td>
<th align="left">Tip</th>
</tr>
<tr>
<td colspan="2" align="left" valign="top">
<p>
To save in a channel the selection done with the Quickmask select
in the image menu <span class="guimenuitem">Select/Save to
Channel</span>
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3335875"></a>Usage</h4>
</div>
</div>
</div>
<div class="procedure">
<ol type="1">
<li>
<p>
<a href="ch05s02s02.html" title="2.2. Open">Open</a> an image or begin a
<a href="ch05s02.html#gimp-file-new" title="2.1. New">new document</a>.
</p>
</li>
<li>
<p>
Activate the Quickmask using the left-bottom button in the
image window. If a selection is present the mask is
initialized with the content of the selection.
</p>
</li>
<li>
<p>
Choose a <a href="ch03s03.html" title="3. Brush Tools">drawing tool</a> and
use it with greyscale colors on the QuickMask.
</p>
</li>
<li>
<p>
Deactivate the Quickmask using the left-bottom button in the image
window.
</p>
</li>
</ol>
</div>
</div>
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<td width="40%" align="right"> <a accesskey="n" href="ch04s04.html">Next</a></td>
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<tr>
<td width="40%" align="left" valign="top">3.4. Selection masks </td>
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> 4. Path dialog</td>
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