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- <h3 class="title"><a id="dialogs-selection-masks"></a>3.4. Selection masks</h3>
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- <img src="../images/dialogs/dialogs-channel-masks.png" />
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- <p>
- Channels can be used to save and restore your selections. Clicking
- on the <span class="guilabel">Quick mask</span> button on the <a href="ch02s03s03.html" title="3.3. Image Window">Image window</a> automatically
- creates a new channel called <span class="guilabel">Qmask</span> and saves the
- displayed active selection to a thumbail in front of the
- channel.There are many selection tools in the Gimp like rectangular
- selection tool or fuzzy selection for continuous selections.
- Selection Masks are a graphical way to build selections into a gray
- level channel where white pixels are selected and black pixels are
- not selected. Therefore gray pixels are partially selected. You can
- think of them as feathering the selection, a smooth transition
- between selected and not selected. This is important to avoid the
- ugly pixelization effect when you fill the selection or when you
- erase its content after isolating a subject from background.
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- <span class="term">Creating Selection Masks</span>
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- <dd>
- <p>
- There are several ways to initialize a selection mask. From the
- image window menu
- <span class="guimenuitem"><span class="accel">S</span>elect</span>/
- <span class="guimenuitem">Save to <span class="accel">C</span>hannel</span> is
- available if there is an active selection. From the image window
- the bottom-left button creates a <a href="ch04s03s05.html" title="3.5. Quick Mask">Quick
- Mask</a>; the content will be initialized with the active
- selection. From the channel dialog, when you click on the
- <span class="guilabel">New channel</span> button or from the context menu.
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- <h4 class="title"><a id="id3449506"></a>Using Selectionmasks</h4>
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- </div>
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- <p>
- Once the channel is initialized, selected (highlighted in blue),
- visible (eye-icon in the dialog), and displayed as you want
- (color and opacity attributes), you can start to work with all
- the paint tools. The colors used are important. If you paint
- with some color other than white, grey, or black, the color Value
- (luminosity) will be used to define a gray (medium, light, or
- dark). When your mask is painted, you can transform it to a
- selection by clicking on the <span class="guilabel">Channel to
- selection</span> button or from the context menu.
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- <p>
- You can work in selection masks not only with the paint tool
- but also with other tools. For instance, you can use the
- selection tools to fill areas uniformly with gradients or
- patterns. By adding many selection masks in your list you can
- easily compose very complex selections. One can say that a
- selection mask is to a selection as a layer is to an image.
- </p>
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- <p>
- As long as a selection mask is activated you are working in the
- mask and not in the image. To work in the image you have to
- deactivate all selection masks. Don't forget also to stop
- displaying masks in the image by removing the eye icon. Check
- also that all RGB and Alpha channels are activated and
- displayed in the image.
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