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13.
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Most plug-ins work on the current layer of the current image. In some cases, you will have to merge all layers (Image->Flatten Image) if you want the plug-in to work on the whole image.
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(no translation yet)
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Located in
tips/gimp-tips.xml.in.h:13
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14.
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Not all effects can be applied to all kinds of images. This is indicated by a grayed-out menu-entry. You may need to change the image mode to RGB (Image->Mode->RGB), add an alpha-channel (Layer->Transparency->Add Alpha Channel) or flatten it (Image->Flatten Image).
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(no translation yet)
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Located in
tips/gimp-tips.xml.in.h:14
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15.
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Pressing and holding the <tt>Shift</tt> key before making a selection allows you to add to the current selection instead of replacing it. Using <tt>Ctrl</tt> before making a selection subtracts from the current one.
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(no translation yet)
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Located in
../data/tips/gimp-tips.xml.in.h:15
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16.
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The GIMP can undo most changes to the image, so feel free to experiment.
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(no translation yet)
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Located in
tips/gimp-tips.xml.in.h:16
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17.
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The GIMP supports gzip compression on the fly. Just add <tt>.gz</tt> (or <tt>.bz2</tt>, if you have bzip2 installed) to the filename and your image will be saved compressed. Of course loading compressed images works too.
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(no translation yet)
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Located in
tips/gimp-tips.xml.in.h:17
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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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(no translation yet)
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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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(no translation yet)
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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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(no translation yet)
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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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(no translation yet)
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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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(no translation yet)
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Located in
tips/gimp-tips.xml.in.h:22
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