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264 lines
7.8 KiB
264 lines
7.8 KiB
<sect1 id="tutorial-select-layer">
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<title>A Small selections and layers tutorial</title>
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<!-- Does someone know a better way to do this? -->
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<screenshot>
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<screeninfo>The starting image</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-sample.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The starting image</phrase>
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</textobject>
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<caption><para>The starting image</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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The image above is the image we will work with. Start chalk with this
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image (in the documentation folder
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<filename>$<envar>TDEDIR</envar>/share/doc/HTML/en/chalk/tutorial-select-layer-sample.png</filename>)
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and save it to your Home folder (by choosing <guilabel>Save Image As...</guilabel>).
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Then open it in &chalk; — your screen will look a bit like this (we have
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zoomed in):
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</para>
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<screenshot>
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<screeninfo>Chalk with the starting image</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-1.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The starting image</phrase>
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</textobject>
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<caption><para>The starting image</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Now try to select the outline of the head with the <guilabel>Select Outline</guilabel> tool:
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Select Outline</guilabel> tool</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-2.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Select Outline</guilabel> tool</phrase>
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</textobject>
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<caption><para>The <guilabel>Select Outline</guilabel> tool</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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After you select it, it should look a bit like this picture:
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</para>
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<screenshot>
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<screeninfo>The picture after selecting the head</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-3.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The picture after selecting the head</phrase>
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</textobject>
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<caption><para>The picture after selecting the head</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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If you accidently select too much, you can cut that part easily off by switching the tool to <guilabel>Subtract</guilabel> mode:
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Subtract</guilabel> mode</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-4.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Subtract</guilabel> mode</phrase>
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</textobject>
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<caption><para>The <guilabel>Subtract</guilabel> mode</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Now it's time to make the edges of the selection a bit fuzzy. This can be done by applying <guilabel>Feather</guilabel> to the selection.
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</para>
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<screenshot>
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<screeninfo><guilabel>Feather</guilabel> selection</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-5.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase><guilabel>Feather</guilabel> selection</phrase>
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</textobject>
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<caption><para><guilabel>Feather</guilabel> selection</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Now cut the selection, using
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<menuchoice><guimenu>Edit</guimenu><guimenuitem>Cut</guimenuitem></menuchoice>.
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Delete the current layer with
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<menuchoice><guimenu>Layer</guimenu><guimenuitem>Remove
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Layer</guimenuitem></menuchoice>. Paste your selection, with
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<menuchoice><guimenu>Edit</guimenu><guimenuitem>Paste</guimenuitem></menuchoice>.
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Now we give ourselves a bit more room to work in by resizing the image a bit.
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Use the <menuchoice><guimenu>Image</guimenu><guimenuitem>Change Image
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Size...</guimenuitem></menuchoice> dialog for this.
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Image Size</guilabel> dialog</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-6.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Image Size</guilabel> dialog</phrase>
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</textobject>
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<caption><para>The <guilabel>Image Size</guilabel> dialog</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Add a new layer, and place it below the old layer. You do this by selecting
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the new layer in the layerbox, and then pressing the little 'down' arrow at the bottom.
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Now we are going to select the area around the head with a contiguous select
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(the tool has a selection-with-bucketfill icon at the border).
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Select Contiguous</guilabel> tool</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-7.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Select Contiguous</guilabel> tool</phrase>
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</textobject>
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<caption><para>The <guilabel>Select Contiguous</guilabel> tool</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Make sure to select <guilabel>Sample merged</guilabel> in the tool options:
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Sample merged</guilabel> option</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-8.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Sample merged</guilabel> option</phrase>
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</textobject>
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<caption><para>The <guilabel>Sample merged</guilabel> option</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Feather the selection again, and invert it.
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Select the <guilabel>Contiguous Fill</guilabel> tool (this is a different tool than
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the <guilabel>Contiguous Select</guilabel> tool) and use it on the layer.
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Contiguous Fill</guilabel> tool</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-9.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Contiguous Fill</guilabel> tool</phrase>
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</textobject>
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<caption><para>The <guilabel>Contiguous Fill</guilabel> tool</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Deselect with <menuchoice><guimenu>Select</guimenu><guimenuitem>Deselect</guimenuitem></menuchoice>.
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You'll notice some artefacts of the feathering at the sides. You can select them easily with a rectangular selection and then cut them.
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Select Rectangular</guilabel> tool</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-10.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Select Rectangular</guilabel> tool</phrase>
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</textobject>
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<caption><para>The <guilabel>Select Rectangular</guilabel> tool</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Move the shadow layer a bit down and to the right to make it look nice.
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</para>
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<screenshot>
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<screeninfo>Moving the shadow layer</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-11.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>Moving the shadow layer</phrase>
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</textobject>
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<caption><para>Moving the shadow layer</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Now you can use the <guilabel>Crop</guilabel> tool to make the image better fit around the head.
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</para>
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<screenshot>
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<screeninfo>The <guilabel>Crop</guilabel> tool</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-12.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The <guilabel>Crop</guilabel> tool</phrase>
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</textobject>
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<caption><para>The <guilabel>Crop</guilabel> tool</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Save the image, and you're done :-)
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</para>
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<screenshot>
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<screeninfo>The resulting image</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="tutorial-select-layer-13.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The resulting image</phrase>
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</textobject>
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<caption><para>The resulting image</para></caption>
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</mediaobject>
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</screenshot>
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<para>
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Thanks go to Bart Coppens for providing this tutorial. The original is available at <ulink url="http://www.bartcoppens.be/chalk/hackergotchi.html">http://www.bartcoppens.be/chalk/hackergotchi.html</ulink>.
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</para>
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</sect1>
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