Slideshow from selected images in folder - LR3 creates previews of all images

I select a number of images in a folder in the Library module and go to the Slideshow module. When I run the slideshow LR3 generates previews of all of the images in the relevant folder - rather than merely those for the images I have selected.
I'm running LR3.2RC in Win 7 64 bit. The same happened with LR3 itself. My recollection (which may be faulty) was that this worked as I would have expected in LR2 (in other words, previews were generated only for the selected images in the folder).
(I know I could add the selected images to a collection but I don't always necessarily wish to do that.)
Stephen

Hi Stephen
In Slideshow module, on the toolbar you can click on the dropdown options against Use:
Make sure you check selected items and not all filmstrip items.
If you can’t see the toolbar above the filmstrip press T and T again to hide it.

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Here´s a nice example that does exactly what I want:
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<head>
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<script src="library.swf"
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</script>
</head>
<body onLoad="doLoad();">
<input id="btnOpen" type="button" value="Open..." />
</body>
</html>

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// gutters may be irregular due to rounding effects;
// thanks to michael l hale and muppet mark;
// for mac and CS6;
// 2014, use it at your own risk;
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// create the arrangement;
if (theFiles.length > 0 && theFiles.length == 3) {
myDocument.activeLayer = myDocument.layers[0];
// create masked group;
var theGroup = myDocument.layerSets.add();
theGroup.name = "arrangement";
// determine the array’s values;
var areaWidth = theArray[2] - theArray[0];
var areaHeight = theArray[3] - theArray[1];
var theDocResolution = myDocument.resolution;
var areaRelation = areaHeight / areaWidth;
// center of placed non-pdf images;
var centerX = Number(myDocument.width / 2);
var centerY = Number(myDocument.height / 2);
// suppress dialogs;
var theDialogSettings = app.displayDialogs;
app.displayDialogs = DialogModes.NO;
var pdfSinglePages = new Array;
var nonPDFs = new Array;
var theDimPDFs = new Array;
var theLength = 0;
// collect the files’ measurements;
var theDimensions = new Array;
var theLengths = new Array;
// array to collect both files and placed pdf-pages;
var theseFiles = new Array;
var theLength = 0;
// collect the files’ measurements;
for (var o = 0; o < theFiles.length; o++) {
    var thisFile = theFiles[o];
          theseFiles.push(thisFile);
          var theDim = getDimensions(thisFile);
          theDimensions.push(theDim);
          theRelativeWidth = 100 / theDim[1] * theDim[0];
          theLength = theLength + theRelativeWidth;
// reset dialogmodes;
app.displayDialogs = DialogModes.ERROR;
// if three files;
if (theseFiles.length == 3) {
// create the layers;
var theNumber = 0;
var theAdded = 0;
var y = areaHeight / 2;
// add placed image’s width;
var thisLineWidth = 0 + theAdded;
var theLastFactor = Number (Number(myDocument.height) / theDimensions[2][1] * theDimensions[2][2] / theDocResolution * 100);
var theLastWidth = Math.round(theDimensions[2][0] * theLastFactor / 100 * theDocResolution / theDimensions[2][2]);
// place the files;
for (var x = 0; x < 3; x++) {
var theNumber = x;
var thisFile = theseFiles[theNumber];
var theFactor = Number (Number(myDocument.height) / theDimensions[theNumber][1] * theDimensions[theNumber][2] / theDocResolution * 100);
var theNewWidth = Math.round(theDimensions[theNumber][0] * theFactor / 100 * theDocResolution / theDimensions[theNumber][2]);
var offsetX = theNewWidth / 2 + thisLineWidth - centerX + theArray[0];
var offsetY = y - centerY + theArray[1];
var theLayer = placeScaleFile (thisFile, offsetX, offsetY, theFactor, theFactor);
myDocument.activeLayer.move(theGroup, ElementPlacement.PLACEATBEGINNING);
thisLineWidth = thisLineWidth + theNewWidth;
// duplicate the middle one;
if (theNumber == 1) {
          while (thisLineWidth < myDocument.width - theLastWidth) {
                    theLayer = duplicateAndOffset (theLayer, theNewWidth, 0);
                    thisLineWidth = thisLineWidth + theNewWidth;
// reset;
app.togglePalettes();
turnOnRescale (check);
app.preferences.rulerUnits = originalRulerUnits;
////// playback to accelerated //////
function setToAccelerated () {
          var idsetd = charIDToTypeID( "setd" );
          var desc1 = new ActionDescriptor();
          var idnull = charIDToTypeID( "null" );
                    var ref1 = new ActionReference();
                    var idPrpr = charIDToTypeID( "Prpr" );
                    var idPbkO = charIDToTypeID( "PbkO" );
                    ref1.putProperty( idPrpr, idPbkO );
                    var idcapp = charIDToTypeID( "capp" );
                    var idOrdn = charIDToTypeID( "Ordn" );
                    var idTrgt = charIDToTypeID( "Trgt" );
                    ref1.putEnumerated( idcapp, idOrdn, idTrgt );
          desc1.putReference( idnull, ref1 );
          var idT = charIDToTypeID( "T   " );
                    var desc2 = new ActionDescriptor();
                    var idperformance = stringIDToTypeID( "performance" );
                    var idperformance = stringIDToTypeID( "performance" );
                    var idaccelerated = stringIDToTypeID( "accelerated" );
                    desc2.putEnumerated( idperformance, idperformance, idaccelerated );
          var idPbkO = charIDToTypeID( "PbkO" );
          desc1.putObject( idT, idPbkO, desc2 );
          executeAction( idsetd, desc1, DialogModes.NO );
////// get psds, tifs and jpgs from files //////
function getFiles (theFile) {
    if (theFile.name.match(/\.(jpg|tif|psd|pdf|)$/i)) {
        return true
////// place //////
function placeScaleFile (file, xOffset, yOffset, theScale) {
// =======================================================
var idPlc = charIDToTypeID( "Plc " );
    var desc5 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
    desc5.putPath( idnull, new File( file ) );
    var idFTcs = charIDToTypeID( "FTcs" );
    var idQCSt = charIDToTypeID( "QCSt" );
    var idQcsa = charIDToTypeID( "Qcsa" );
    desc5.putEnumerated( idFTcs, idQCSt, idQcsa );
    var idOfst = charIDToTypeID( "Ofst" );
        var desc6 = new ActionDescriptor();
        var idHrzn = charIDToTypeID( "Hrzn" );
        var idPxl = charIDToTypeID( "#Pxl" );
        desc6.putUnitDouble( idHrzn, idPxl, xOffset );
        var idVrtc = charIDToTypeID( "Vrtc" );
        var idPxl = charIDToTypeID( "#Pxl" );
        desc6.putUnitDouble( idVrtc, idPxl, yOffset );
    var idOfst = charIDToTypeID( "Ofst" );
    desc5.putObject( idOfst, idOfst, desc6 );
    var idWdth = charIDToTypeID( "Wdth" );
    var idPrc = charIDToTypeID( "#Prc" );
    desc5.putUnitDouble( idWdth, idPrc, theScale );
    var idHght = charIDToTypeID( "Hght" );
    var idPrc = charIDToTypeID( "#Prc" );
    desc5.putUnitDouble( idHght, idPrc, theScale );
    var idLnkd = charIDToTypeID( "Lnkd" );
    desc5.putBoolean( idLnkd, true );
executeAction( idPlc, desc5, DialogModes.NO );
return myDocument.activeLayer;
////// open pdf //////
function openPDF (theImage, x) {
// define pdfopenoptions;
var pdfOpenOpts = new PDFOpenOptions;
pdfOpenOpts.antiAlias = true;
pdfOpenOpts.bitsPerChannel = BitsPerChannelType.EIGHT;
pdfOpenOpts.cropPage = CropToType.TRIMBOX;
pdfOpenOpts.mode = OpenDocumentMode.CMYK;
pdfOpenOpts.resolution = 10;
pdfOpenOpts.suppressWarnings = true;
pdfOpenOpts.usePageNumber = true;
// suppress dialogs;
var theDialogSettings = app.displayDialogs;
app.displayDialogs = DialogModes.NO;
pdfOpenOpts.page = x;
var thePdf = app.open(theImage, pdfOpenOpts);
thePdf.close(SaveOptions.DONOTSAVECHANGES);
// reset dialogmodes;
app.displayDialogs = theDialogSettings;
////// turn off preference to scale placed image //////
function turnOffRescale () {
// determine if the resize prefernce is on;
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID("capp"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
var appDesc = executeActionGet(ref);
var prefDesc = appDesc.getObjectValue(charIDToTypeID( "GnrP" ));
var theResizePref = prefDesc.getBoolean(stringIDToTypeID( "resizePastePlace" ));
// turn off resize image during place;
if (theResizePref == true);{
// =======================================================
var idsetd = charIDToTypeID( "setd" );
    var desc12 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref4 = new ActionReference();
        var idPrpr = charIDToTypeID( "Prpr" );
        var idGnrP = charIDToTypeID( "GnrP" );
        ref4.putProperty( idPrpr, idGnrP );
        var idcapp = charIDToTypeID( "capp" );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref4.putEnumerated( idcapp, idOrdn, idTrgt );
    desc12.putReference( idnull, ref4 );
    var idT = charIDToTypeID( "T   " );
        var desc13 = new ActionDescriptor();
        var idresizePastePlace = stringIDToTypeID( "resizePastePlace" );
        desc13.putBoolean( idresizePastePlace, false );
    var idGnrP = charIDToTypeID( "GnrP" );
    desc12.putObject( idT, idGnrP, desc13 );
executeAction( idsetd, desc12, DialogModes.NO );
return theResizePref
////// turn on preference to scale plced image //////
function turnOnRescale (check) {
if (check == true) {
// =======================================================
var idsetd = charIDToTypeID( "setd" );
    var desc14 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref5 = new ActionReference();
        var idPrpr = charIDToTypeID( "Prpr" );
        var idGnrP = charIDToTypeID( "GnrP" );
        ref5.putProperty( idPrpr, idGnrP );
        var idcapp = charIDToTypeID( "capp" );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref5.putEnumerated( idcapp, idOrdn, idTrgt );
    desc14.putReference( idnull, ref5 );
    var idT = charIDToTypeID( "T   " );
        var desc15 = new ActionDescriptor();
        var idresizePastePlace = stringIDToTypeID( "resizePastePlace" );
        desc15.putBoolean( idresizePastePlace, true );
    var idGnrP = charIDToTypeID( "GnrP" );
    desc14.putObject( idT, idGnrP, desc15 );
executeAction( idsetd, desc14, DialogModes.NO );
////// convert to so if not one aready //////
function duplicateAndOffset (theLayer, theXOffset, theYOffset) {
app.activeDocument.activeLayer = theLayer;
// =======================================================
var idcopy = charIDToTypeID( "copy" );
    var desc9 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref5 = new ActionReference();
        var idLyr = charIDToTypeID( "Lyr " );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref5.putEnumerated( idLyr, idOrdn, idTrgt );
    desc9.putReference( idnull, ref5 );
    var idT = charIDToTypeID( "T   " );
        var desc10 = new ActionDescriptor();
        var idHrzn = charIDToTypeID( "Hrzn" );
        var idRlt = charIDToTypeID( "#Pxl" );
        desc10.putUnitDouble( idHrzn, idRlt, theXOffset );
        var idVrtc = charIDToTypeID( "Vrtc" );
        var idRlt = charIDToTypeID( "#Pxl" );
        desc10.putUnitDouble( idVrtc, idRlt, theYOffset );
    var idOfst = charIDToTypeID( "Ofst" );
    desc9.putObject( idT, idOfst, desc10 );
executeAction( idcopy, desc9, DialogModes.NO );
return app.activeDocument.activeLayer
////// load pdf as smart object //////
function transformLayer (layer, percentage, xOffset, yOffset) {
app.activeDocument.activeLayer = layer;
// =======================================================
var idTrnf = charIDToTypeID( "Trnf" );
    var desc4 = new ActionDescriptor();
    var idFTcs = charIDToTypeID( "FTcs" );
    var idQCSt = charIDToTypeID( "QCSt" );
    var idQcsa = charIDToTypeID( "Qcsa" );
    desc4.putEnumerated( idFTcs, idQCSt, idQcsa );
    var idOfst = charIDToTypeID( "Ofst" );
        var desc5 = new ActionDescriptor();
        var idHrzn = charIDToTypeID( "Hrzn" );
        var idPxl = charIDToTypeID( "#Pxl" );
        desc5.putUnitDouble( idHrzn, idPxl, xOffset );
        var idVrtc = charIDToTypeID( "Vrtc" );
        var idPxl = charIDToTypeID( "#Pxl" );
        desc5.putUnitDouble( idVrtc, idPxl, yOffset );
    var idOfst = charIDToTypeID( "Ofst" );
    desc4.putObject( idOfst, idOfst, desc5 );
    var idWdth = charIDToTypeID( "Wdth" );
    var idPrc = charIDToTypeID( "#Prc" );
    desc4.putUnitDouble( idWdth, idPrc, percentage );
    var idHght = charIDToTypeID( "Hght" );
    var idPrc = charIDToTypeID( "#Prc" );
    desc4.putUnitDouble( idHght, idPrc, percentage );
    var idLnkd = charIDToTypeID( "Lnkd" );
    desc4.putBoolean( idLnkd, true );
    var idAntA = charIDToTypeID( "AntA" );
    desc4.putBoolean( idAntA, true );
executeAction( idTrnf, desc4, DialogModes.NO );
return app.activeDocument.activeLayer
////// function to get file’s dimensions, thanks to michael l hale //////
function getDimensions( file ){
function divideString (theString) {
          theString = String(theString);
    var a = Number(theString.slice(0, theString.indexOf("\/")));
    var b = Number(theString.slice(theString.indexOf("\/") + 1));
    return (a / b)
// from a script by michael l hale;
function loadXMPLibrary(){
     if ( !ExternalObject.AdobeXMPScript ){
          try{
               ExternalObject.AdobeXMPScript = new ExternalObject
                                                            ('lib:AdobeXMPScript');
          }catch (e){
               alert( ErrStrs.XMPLIB );
               return false;
     return true;
function unloadXMPLibrary(){
   if( ExternalObject.AdobeXMPScript ) {
      try{
         ExternalObject.AdobeXMPScript.unload();
         ExternalObject.AdobeXMPScript = undefined;
      }catch (e){
         alert( ErrStrs.XMPLIB );
////// based on a script by muppet mark //////
function dimensionsShellScript (file) {
          try {
// getMetaDataMDLS;
if (File(file) instanceof File && File(file).exists) {
          var shellString = "/usr/bin/mdls ";
          shellString += File(file).fsName;
//          shellString += File(file).fullName;
          shellString += ' > ~/Documents/StdOut2.txt';
          app.system(shellString);
// read the file;
if (File('~/Documents/StdOut2.txt').exists == true) {
    var file = File('~/Documents/StdOut2.txt');
    file.open("r");
    file.encoding= 'BINARY';
    var theText = new String;
    for (var m = 0; m < file.length; m ++) {
                    theText = theText.concat(file.readch());
          file.close();
          theText = theText.split("\n");
// get the dimensions;
          var dim = new Array;
          for (var m = 0; m < theText.length; m++) {
                    var theLine = theText[m];
                    if (theLine.indexOf("kMDItemPixelWidth") != -1) {dim.push(theLine.match(/[\d\.]+/g).join("") )}
                    if (theLine.indexOf("kMDItemPixelHeight") != -1) {dim.push(theLine.match(/[\d\.]+/g).join("") )}
                    if (theLine.indexOf("kMDItemResolutionWidthDPI") != -1) {dim.push(theLine.match(/[\d\.]+/g).join("") )}
                    if (theLine.indexOf("kMDItemResolutionHeightDPI") != -1) {dim.push(theLine.match(/[\d\.]+/g).join("") )}
// remove file and hand back;
          File('~/Documents/StdOut2.txt').remove();
catch (e) {
          if (File('~/Documents/StdOut2.txt').exists == true) {File('~/Documents/StdOut2.txt').remove()};
          return dim
          try{
                    loadXMPLibrary();
                    var xmpf = new XMPFile( file.fsName, XMPConst.UNKNOWN, XMPConst.OPEN_FOR_READ );
                    var xmp = xmpf.getXMP();
                    xmpf.closeFile();
                    var resolutionUnit = xmp.getProperty( XMPConst.NS_TIFF, 'ResolutionUnit', XMPConst.STRING);
                    var resFactor = 1;
                    if (resolutionUnit == 2) {
                              var resFactor = 1;
                    if (resolutionUnit == 3) {
                              var resFactor = 2.54;
                    var dim = [xmp.getProperty( XMPConst.NS_EXIF, 'PixelXDimension', XMPConst.STRING),
                    xmp.getProperty( XMPConst.NS_EXIF, 'PixelYDimension', XMPConst.STRING),
                    divideString (xmp.getProperty( XMPConst.NS_TIFF, 'XResolution', XMPConst.STRING)) * resFactor,
                    divideString (xmp.getProperty( XMPConst.NS_TIFF, 'YResolution', XMPConst.STRING)) * resFactor];
                    unloadXMPLibrary();
                    if(dim[0]=="undefined" || dim[1]=="undefined"){
            var dim = undefined;
            var res = undefined;
            var bt = new BridgeTalk;
            bt.target = "bridge";
            var myScript = ("var ftn = " + psRemote.toSource() + "; ftn("+file.toSource()+");");
            bt.body = myScript;
            bt.onResult = function( inBT ) {myReturnValue(inBT.body); }
            bt.send(10);
                    function myReturnValue(str){
                              res = str;
                              dim = str.split(',');
                    function psRemote(file){
                              var t= new Thumbnail(file);
                              return t.core.quickMetadata.width+','+t.core.quickMetadata.height;
    }catch(e){unloadXMPLibrary()};
          if (String(dim[2]).indexOf("\/") != -1) {
                    var a = divideString(dim[2]);
                    var b = divideString(dim[3]);
                    dim = [dim[0], dim[1], a, b]
// if dimensions are missing as might be the case with some bitmap tiffs for example try a shell-script;
          if (dim[0] == undefined || dim[1] == undefined) {
                    var array = dimensionsShellScript(file);
                    dim = array;
// if shell-string failed open doc to get measurements;
          if (dim[0] == undefined || dim[1] == undefined) {
                    var thisDoc = app.open (File(file));
// close ai without saving;
                    if (file.name.slice(-3).match(/\.(ai)$/i)) {
                              thisDoc.trim(TrimType.TRANSPARENT);
                              var dim = [thisDoc.width, thisDoc.height, thisDoc.resolution, thisDoc.resolution];
                              thisDoc.close(SaveOptions.DONOTSAVECHANGES)
                    else {
                              var dim = [thisDoc.width, thisDoc.height, thisDoc.resolution, thisDoc.resolution];
                              thisDoc.close(SaveOptions.PROMPTTOSAVECHANGES)
return dim;

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