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18.
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The GIMP uses layers to let you organize your image. Think of them as a stack of slides or filters, such that looking through them you see a composite of their contents.
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GIMP 使用圖層來組織影像。可將圖層想像成一疊投影片或濾鏡，將它們重疊後可以看到整合後的內容。
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:18
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19.
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The layer named "Background" is special because it lacks transparency. This prevents you from moving the layer up in the stack. You may add transparency to it by right-clicking in the Layers dialog and selecting "Add Alpha Channel".
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圖層中稱為「背景」的一層是比較特殊的，因為它沒有透明度。這樣會妨礙您加上圖層遮罩或將圖層移至較面層的位置。在「圖層」對話方塊中按右邊滑鼠按鈕並選取「新增透明色版」可以替它加上透明度。
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:19
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20.
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To create a circle-shaped selection, hold <tt>Shift</tt> while doing an ellipse select. To place a circle precisely, drag horizontal and vertical guides tangent to the circle you want to select, place your cursor at the intersection of the guides, and the resulting selection will just touch the guides.
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若要選擇正圓形區域，方法是選擇橢圓區域時按下 <tt>Shift</tt> 鍵。若要精確地選取放置圓形的位置，先拖曳水平及垂直參考線至目標圓形的切線位置，再用滑鼠選取參考線的交點，得出來的選擇區域便會僅僅接觸到參考線。
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:20
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21.
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When using a drawing tool (Paintbrush, Airbrush, or Pencil), <tt>Shift</tt>-click will draw a straight line from your last drawing point to your current cursor position. If you also press <tt>Ctrl</tt>, the line will be constrained to 15 degree angles.
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當使用繪圖工具 (畫筆、噴槍或鉛筆) 時，按 <tt>Shift</tt> 鍵再按滑鼠按鈕會由上一點繪畫一條直線到目前的位置。若再按 <tt>Ctrl</tt> 鍵，線條的角度會限制為 15°的倍數。
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:21
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22.
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When you save an image to work on it again later, try using XCF, the GIMP's native file format (use the file extension <tt>.xcf</tt>). This preserves the layers and every aspect of your work-in-progress. Once a project is completed, you can save it as JPEG, PNG, GIF, ...
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如果儲存一幅將來可能會再修改的影像，可試試使用 XCF，即 GIMP 內定使用的影像格式 (延伸檔名為 <tt>.xcf</tt>)。這樣會保留所有圖層及任何影像的細節。影像完成後，可以將影像另存為 JPEG、PNG、GIF 等等...
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:22
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23.
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You can adjust or move a selection by using <tt>Alt</tt>-drag. If this makes the window move, your window manager uses the <tt>Alt</tt> key already. Try pressing <tt>Shift</tt> at the same time.
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按 <tt>Alt</tt> 鍵再用滑鼠拖曳可以調整和重新放置選擇區域。如果這個組合令視窗移動，即表示視窗總管已經使用了 <tt>Alt</tt>鍵。這個時候，請試試同時按下 <tt>Shift</tt> 鍵。
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:23
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24.
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You can adjust the selection range for fuzzy select by clicking and dragging left and right.
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您可以調整模糊選擇區域的範圍，方法是按下滑鼠按鈕後向左或右拖曳。
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:24
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25.
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You can create and edit complex selections using the Path tool. The Paths dialog allows you to work on multiple paths and to convert them to selections.
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您可以使用路徑工具來製作及修改複雜的選擇區域。在「路徑」對話方塊中，您可以同時處理多個路徑並將它們轉換為選擇區域。
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Translated and reviewed by
Abel Cheung
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Located in
../data/tips/gimp-tips.xml.in.h:18
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26.
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You can drag a layer from the Layers dialog and drop it onto the toolbox. This will create a new image containing only that layer.
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您可以在「圖層」對話方塊中拖曳一個圖層並將之放進工具箱內。這樣會產生一幅只含有該圖層的圖片。
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Translated by
Chao-Hsiung Liao
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Located in
../data/tips/gimp-tips.xml.in.h:12
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27.
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You can drag and drop many things in the GIMP. For example, dragging a color from the toolbox or from a color palette and dropping it into an image will fill the current image or selection with that color.
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GIMP 裡面很多東西都是可以拖曳的。舉個例子，從工具箱或色盤裡拖曳一種顏色出來並放到影像上，會將目前的影像或選擇區域填滿該種顏色。
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Translated and reviewed by
Abel Cheung
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Located in
tips/gimp-tips.xml.in.h:27
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