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var tifOptions = new TiffSaveOptions(); //var jpegOptions = new JPEGSaveOptions();
tifOptions.quality = 12; //Options.quality    = 12;   // Qualite jpeg
tifOptions.layers = false;
// go to 8 bit 
activeDocument.bitsPerChannel = BitsPerChannelType.EIGHT;

Doc.saveAs(new File(TargetPath + "/" + TargetName + ".tif"), tifOptions, true);

/************************************************************************
                        Save Layers
 ************************************************************************
 13/12/2011 Habaki : Creation
 ************************************************************************/
var Doc = app.activeDocument;
var tifOptions = new TiffSaveOptions(); //var jpegOptions = new JPEGSaveOptions();
tifOptions.quality = 12; //Options.quality    = 12;   // Qualite jpeg
tifOptions.layers = false;
// go to 8 bit 
activeDocument.bitsPerChannel = BitsPerChannelType.EIGHT;
/*----------------------------------------------------------------------*
            Make a Selection with current Layer
 *----------------------------------------------------------------------*/
function LayerDoSelection()
{
  var idsetd = charIDToTypeID( "setd" );
  var desc90 = new ActionDescriptor();
  var idnull = charIDToTypeID( "null" );
  var ref24 = new ActionReference();
  var idChnl = charIDToTypeID( "Chnl" );
  var idfsel = charIDToTypeID( "fsel" );
  ref24.putProperty( idChnl, idfsel );
  desc90.putReference( idnull, ref24 );
  var idT = charIDToTypeID( "T   " );
  var ref25 = new ActionReference();
  var idChnl = charIDToTypeID( "Chnl" );
  var idChnl = charIDToTypeID( "Chnl" );
  var idTrsp = charIDToTypeID( "Trsp" );
  ref25.putEnumerated( idChnl, idChnl, idTrsp );
  desc90.putReference( idT, ref25 );
  executeAction( idsetd, desc90, DialogModes.NO );
}
/*----------------------------------------------------------------------*
            Crop selection
 *----------------------------------------------------------------------*/
function SelectionCrop()
{
  var idCrop = charIDToTypeID( "Crop" );
  var desc91 = new ActionDescriptor();
  executeAction( idCrop, desc91, DialogModes.NO );
}
/*----------------------------------------------------------------------*
            Alt Ctrl Z
 *----------------------------------------------------------------------*/
function ACZ() {
  var idslct = charIDToTypeID( "slct" );
  var desc95 = new ActionDescriptor();
  var idnull = charIDToTypeID( "null" );
  var ref28 = new ActionReference();
  var idHstS = charIDToTypeID( "HstS" );
  var idOrdn = charIDToTypeID( "Ordn" );
  var idPrvs = charIDToTypeID( "Prvs" );
  ref28.putEnumerated( idHstS, idOrdn, idPrvs );
  desc95.putReference( idnull, ref28 );
  executeAction( idslct, desc95, DialogModes.NO );
}
/*----------------------------------------------------------------------*
                        Main
 *----------------------------------------------------------------------*/
try {
  var i;
  var L;
  var TargetPath, TargetName;
  
  for (i = 0; i < Doc.layers.length; i++) {
    L = Doc.layers[i];
    if (L.isBackgroundLayer) continue;
    Doc.activeLayer = L;
    LayerDoSelection();
    SelectionCrop();
    // Sauvegarde
    TargetPath = Doc.path;
    TargetName = Doc.name.slice(0,-4) + "_Zone" + (i+1);
    Doc.saveAs(new File(TargetPath + "/" + TargetName + ".tif"), tifOptions, true);
    ACZ();
    ACZ();
  } // for
  Doc.close(SaveOptions.DONOTSAVECHANGES);
} catch (ex) {
  alert(ex.message);
}