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- <th colspan="3" align="center">3. 
- <span lang="en" xml:lang="en">QuickMask</span>
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- <span lang="en" xml:lang="en">Painting with GIMP</span>
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- <h2 class="title" style="clear: both"><a id="gimp-image-window-qmask-button"></a>3. 
- <span lang="en" xml:lang="en">QuickMask</span>
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- <p class="title">
- <b>Figure 7.9. 
- <span lang="en" xml:lang="en">Image with QuickMask enabled</span>
- </b>
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- <div class="figure-contents">
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- <img src="../images/dialogs/dialogs-channel-quickmask.png" alt="Image with QuickMask enabled" />
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- <br class="figure-break" />
- <p>
- The <a class="link" href="gimp-tools-selection.html" title="2. Selection Tools">selection tools</a>
- sometimes show their limits when they have to be used for creating a
- complex selection. In these cases, using the QuickMask can make
- things much easier. Simply put, the QuickMask allows you to paint a
- selection instead of just tracing its outline.
- </p>
- <div class="sect2" lang="en" xml:lang="en">
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- <div>
- <div>
- <h3 class="title"><a id="id2592899"></a>3.1. 
- <span lang="en" xml:lang="en">Overview</span>
- </h3>
- </div>
- </div>
- </div>
- <p>
- Normally when you create a selection in GIMP, you see it represented by
- the "marching ants" that trace along its outline. But really there may
- be a lot more to a selection than the marching ants show you: in GIMP a
- selection is actually a full-fledged grayscale channel, covering the
- image, with pixel values ranging from 0 (unselected) to 255 (fully
- selected). The marching ants are drawn along a contour of half-selected
- pixels. Thus, what the marching ants show you as either inside or
- outside the boundary is really just a slice through a continuum.
- </p>
- <p>
- The QuickMask is GIMP's way of showing you the full structure of the
- selection. Activating it also gives you the ability to interact with the
- selection in new, and substantially more powerful, ways. To activate the
- QuickMask, click on the small red-outlined button at the lower left of
- the image window. The button is a toggle, so clicking it again will
- return you to normal marching-ant mode. You can also activate the
- QuickMask by selecting in the image window menu
- <span class="guimenu">Select</span> ‚Üí <span class="guimenuitem">Toggle QuickMask</span>, or by using the
- <span class="keycap"><strong>Shift</strong></span>+<span class="keycap"><strong>Q</strong></span>
- shortcut.
- </p>
- <p>
- Activating the QuickMask shows you the selection as though it were a
- translucent screen overlying the image, whose transparency at each pixel
- indicates the degree to which that pixel is selected. By default the
- mask is shown in red, but you can change this if another mask color
- would be more convenient. The less a pixel is selected, the more it is
- obscured by the mask. Fully selected pixels are shown completely clear.
- </p>
- <p>
- When you are in QuickMask mode, many image manipulations act on the
- selection channel rather than the image itself. This includes, in
- particular, paint tools. Painting with white causes the painted pixels to
- be selected; painting with black causes them to be unselected. You can use
- any of the paint tools, as well as the bucket fill and gradient fill
- tools, in this way. Advanced users of GIMP learn that
- “<span class="quote">painting the selection</span>”
- is the easiest and most effective way to delicately manipulate it.
- </p>
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- <table border="0" summary="Tip">
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- <img alt="[Tip]" src="../images/tip.png" />
- </td>
- <th align="left">Tip</th>
- </tr>
- <tr>
- <td align="left" valign="top">
- <p>
- To save the selection done by the Quickmask to a new channel; Make
- sure that there is a selection and that Quickmask is not active in
- the image window. Select in the image menu
- <span class="guimenuitem">Select/Save to Channel</span>. This will create
- a new channel in the channel dialog called SelectionMask 1.
- </p>
- </td>
- </tr>
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- <th align="left">Tip</th>
- </tr>
- <tr>
- <td align="left" valign="top">
- <p>
- When QuickMask is active, Cut and Paste act on the selection rather
- than the image. You can sometimes make use of this as the most
- convenient way of transferring a selection from one image to another.
- </p>
- </td>
- </tr>
- </table>
- </div>
- <p>
- You can learn more on <a class="link" href="gimp-channel-dialog.html#gimp-qmask" title="2.2.4.  Quick Mask">Quickmask</a> and
- <a class="link" href="gimp-channel-dialog.html#dialogs-selection-masks" title="2.2.3.  Selection masks">Selection masks</a> in the
- section dedicated to the channel dialog.
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