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I could only find one section that might affect the resolution, and have implimented it in this code, lets hope it works, it suppose to stop downsampling.

[code]

#target photoshop;

app.displayDialogs = DialogModes.NO;

Array.prototype.humanSort = function() { 

  return this.sort(function(a, b) {

    aa = a.split(/(\d+)/);

    bb = b.split(/(\d+)/);

    for(var x = 0; x < Math.max(aa.length, bb.length); x++) {

      if(aa[x] != bb[x]) {

        var cmp1 = (isNaN(parseInt(aa[x],10)))? aa[x] : parseInt(aa[x],10);

        var cmp2 = (isNaN(parseInt(bb[x],10)))? bb[x] : parseInt(bb[x],10);

        if(cmp1 == undefined || cmp2 == undefined)

          return aa.length - bb.length;

        else

          return (cmp1 < cmp2) ? -1 : 1;

      }

    }

    return 0;

  });

}

var topLevel = Folder.selectDialog("Please select top level folder");

if(topLevel != null ){

var folders =[];

folders = FindAllFolders(topLevel, folders);

folders.unshift(topLevel);

for(var z =0;z<folders.length;z++){

files = folders[z].getFiles("*.jpg");

filelist=[];

for(var f in files){ filelist.push(decodeURI(files[f])); }

filelist.humanSort();

createPresentation(folders[z]);

files=[];

filelist=[];

    }

}

function createPresentation(Dir){   

    var d = new ActionDescriptor(); 

    var list = new ActionList();  

    for(var h=1;h<filelist.length;h++) list.putPath(File(filelist[h]));     

    d.putList(stringIDToTypeID("filesList"), list);     

    d.putPath(stringIDToTypeID("to"), new File(Dir + "/" + decodeURI(Dir.name) + ".pdf"));    

    d.putBoolean(stringIDToTypeID("includeAnnotations"), true);  

    d.putEnumerated(stringIDToTypeID("backgroundColor"), stringIDToTypeID("backgroundColor"), stringIDToTypeID("white")); 

    d.putBoolean(stringIDToTypeID("autoAdvance"), true); 

    d.putInteger(stringIDToTypeID("autoAdvanceSeconds"), 5); 

    d.putBoolean(stringIDToTypeID("loop"), true); 

    d.putEnumerated(stringIDToTypeID("transition"), stringIDToTypeID("transition"), stringIDToTypeID("random")); 

    d.putBoolean(stringIDToTypeID("presentation"), true); 

    var d1 = new ActionDescriptor(); 

    d1.putString(stringIDToTypeID("pdfPresetFilename"), "High Quality Print"); 

    d1.putBoolean(stringIDToTypeID("pdfPreserveEditing"), true); 

    d1.putBoolean(stringIDToTypeID("pdfViewAfterSave"), false); 

    d1.putInteger(stringIDToTypeID("pdfCompressionType"), 10); 

    d1.putEnumerated( stringIDToTypeID( "pdfDownSample" ), stringIDToTypeID( "pdfDownSample" ), charIDToTypeID( "None" ));

    d.putObject(stringIDToTypeID("as"), stringIDToTypeID("photoshopPDFFormat"), d1); 

    executeAction(stringIDToTypeID("PDFExport"), d, DialogModes.NO);

};

function FindAllFolders( srcFolderStr, destArray) {

    var fileFolderArray = Folder( srcFolderStr ).getFiles();

    for ( var i = 0; i < fileFolderArray.length; i++ ) {

        var fileFoldObj = fileFolderArray[i];

        if ( fileFoldObj instanceof File ) {           

        } else {

         destArray.push( Folder(fileFoldObj) );

        FindAllFolders( fileFoldObj.toString(), destArray );

        }

    }

    return destArray;

}

[/code]