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0072 CLASS="section"
0073 ><H1
0074 CLASS="section"
0075 ><A
0076 NAME="AEN126"
0077 >5. Using Stopmotion with your webcamera</A
0078 ></H1
0079 ><P
0080 >&#13;          The real value of using Stopmotion lies in working directly
0081             against a webcamera.
0082         </P
0083 ><P
0084 >&#13;          If you have a webcamera that works on your linux distribution and <SPAN
0085 CLASS="application"
0086 >vgrabbj</SPAN
0087 > installed
0088             you can start the camera by pressing the 
0089             <SPAN
0090 CLASS="guiicon"
0091 ><IMG
0092 SRC="icons/cameraon.png"></SPAN
0093 > (<B
0094 CLASS="shortcut"
0095 ><B
0096 CLASS="keycap"
0097 >C</B
0098 ></B
0099 >)
0100             button. 
0101         </P
0102 ><P
0103 >&#13;          If not you can go to the the next section ``Changing the import settings'' to set
0104             up your camera correctly.
0105             <DIV
0106 CLASS="figure"
0107 ><A
0108 NAME="AEN137"
0109 ></A
0110 ><P
0111 ><B
0112 >Figure 4. 
0113                     The Camera menu
0114                 </B
0115 ></P
0116 ><P
0117 ><IMG
0118 SRC="screenshots/camera_running.png"></P
0119 ></DIV
0120 >
0121         </P
0122 ><DIV
0123 CLASS="note"
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0125 ></P
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0142 ><P
0143 >&#13;              For this to work you have to turn of all other programs
0144                 using the webcamera.
0145             </P
0146 ></TD
0147 ></TR
0148 ></TABLE
0149 ></DIV
0150 ><P
0151 >&#13;          When the camera is on you have three modes for viewing the video.
0152             These modes have different purposes and are there to assist you 
0153             in creating your animations.
0154             <P
0155 ></P
0156 ><DIV
0157 CLASS="variablelist"
0158 ><DL
0159 ><DT
0160 >Image mixing/Onionskinning (Shortcut: <B
0161 CLASS="keycap"
0162 >1</B
0163 >)</DT
0164 ><DD
0165 ><P
0166 >&#13;                          The image mixing is probably the view mode
0167                             you will be using the most. This mode allows
0168                             you to view previous pictures (up to five) on
0169                             top of the camera. This way you can position
0170                             the figure in relation to the previous frames
0171                             so that you can create smooth motions.
0172                             <DIV
0173 CLASS="figure"
0174 ><A
0175 NAME="AEN150"
0176 ></A
0177 ><P
0178 ><B
0179 >Figure 5. 
0180                                     The onionskinning/mixing mode
0181                                 </B
0182 ></P
0183 ><P
0184 ><IMG
0185 SRC="screenshots/mixing.png"></P
0186 ></DIV
0187 >
0188                         </P
0189 ><P
0190 >&#13;                          You can change the number of pictures to
0191                             view on top of the camera with the ``Number of mixes'' slider
0192                             on the camera panel.
0193                         </P
0194 ></DD
0195 ><DT
0196 >Image differentiation (Shortcut: <B
0197 CLASS="keycap"
0198 >2</B
0199 >)</DT
0200 ><DD
0201 ><P
0202 >&#13;                          The image differentiation mode is primarily meant
0203                             as a tool for moving the figure back to a previous
0204                             position. 
0205                         </P
0206 ><P
0207 >&#13;                          It displays the difference between the selected frame and the camera.
0208                             This way if an object in front off the camera has been
0209                             involountairly moved (fallen, etc) you can use the
0210                             differentiation mode, together with the image mixing, to
0211                             move the object back to its previous position.
0212                         </P
0213 ><P
0214 >&#13;                          This can be done by
0215                             moving the figure until the picture is black, which
0216                             means the selected frame and the camera are ``equal''.
0217                             <DIV
0218 CLASS="figure"
0219 ><A
0220 NAME="AEN162"
0221 ></A
0222 ><P
0223 ><B
0224 >Figure 6. 
0225                                     The differentiation mode
0226                                 </B
0227 ></P
0228 ><P
0229 ><IMG
0230 SRC="screenshots/differentiation.png"></P
0231 ></DIV
0232 >
0233                         </P
0234 ></DD
0235 ><DT
0236 >Playback (Shortcut: <B
0237 CLASS="keycap"
0238 >3</B
0239 >)</DT
0240 ><DD
0241 ><P
0242 >&#13;                          The playback mode will continuously run the the already recorded frames as
0243                             an animation with the input from the camera as the final frame.
0244                         </P
0245 ><P
0246 >&#13;                      This way you can see the camera input, which will become the next frame, together
0247                         with the previous frames as an animation.
0248                         </P
0249 ><DIV
0250 CLASS="figure"
0251 ><A
0252 NAME="AEN172"
0253 ></A
0254 ><P
0255 ><B
0256 >Figure 7. 
0257                                 The playback mode
0258                             </B
0259 ></P
0260 ><P
0261 ><IMG
0262 SRC="screenshots/playback.png"></P
0263 ></DIV
0264 ><P
0265 >&#13;                          You can specify how many frame backwards that should be played (up to 50) with
0266                             the ``Number of images'' slider on the camera panel, and you can set how fast 
0267                             they should played with the FPS chooser on the preview panel.
0268                         </P
0269 ></DD
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