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- <title>3.5. Quick Mask</title>
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- <th colspan="3" align="center" id="chaptername">3. Channels dialog</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>
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- <a id="id3449569" 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="id3449628"></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="id3449675"></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="id3449753"></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="id3449868"></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="left" valign="top">3.4. Selection masks </td>
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