How to convert an image from 72 dpi to 300 dpi image?

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  try {
    var data = GetDataFromDocument( activeDocument );
    if ('eps' == data.extension.toLowerCase()) {
    //convert to cmyk
    Switch();
    }
    else{
    //run code to square up images
    toSquare();
    }
  }
  catch( e ) {
    alert(e);
  }
  
  
  
  
  
  
  //FUNCTIONS
  ///////////////////////////////////////////////
  ///////////////////////////////////////////////
  
  
  function toSquare(){
    var savedRuler= app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS;
    var w = app.activeDocument.width;
    var h = app.activeDocument.height;
    if(w>h) app.activeDocument.resizeCanvas (w, w, AnchorPosition.MIDDLECENTER);
    if(w<h) app.activeDocument.resizeCanvas (h, h, AnchorPosition.MIDDLECENTER);
    //if w==h already square
    app.preferences.rulerUnits = savedRuler;
  }
  
  
  ///////////////////////////////////////////////
  
  
  function GetDataFromDocument( inDocument ) {
    var data = new Object();
    var fullPathStr = inDocument.fullName.toString();
    var lastDot = fullPathStr.lastIndexOf( "." );
    var fileNameNoPath = fullPathStr.substr( 0, lastDot );
    data.extension = fullPathStr.substr( lastDot + 1, fullPathStr.length );
    var lastSlash = fullPathStr.lastIndexOf( "/" );
    data.fileName = fileNameNoPath.substr( lastSlash + 1, fileNameNoPath.length );
    data.folder = fileNameNoPath.substr( 0, lastSlash );
    data.fileType = inDocument.fullName.type;
    return data;
  }
  
  
  ///////////////////////////////////////////////
  
  
  function Switch() {
    var eventModeChange = stringIDToTypeID( "8cba8cd6-cb66-11d1-bc43-0060b0a13dc4" );
    var descSource = new ActionDescriptor();
    var keySourceMode = charIDToTypeID( "SrcM" );
    var list = new ActionList();
    var keyCondition = charIDToTypeID( "Cndn" );
    var keyBitmap = charIDToTypeID( "UBtm" );
    var keyGrayscale = charIDToTypeID( "UGry" );
    var keyDuotone = charIDToTypeID( "UDtn" );
    var keyIndex = charIDToTypeID( "UInd" );
    var keyRGB = charIDToTypeID( "URGB" );
    var keyCMYK = charIDToTypeID( "UCMY" );
    var keyLab = charIDToTypeID( "ULab" );
    var keyMultichannel = charIDToTypeID( "UMlt" );
    list.putEnumerated( keyCondition, keyBitmap );
    list.putEnumerated( keyCondition, keyGrayscale );
    list.putEnumerated( keyCondition, keyDuotone );
    list.putEnumerated( keyCondition, keyIndex );
    list.putEnumerated( keyCondition, keyRGB );
    list.putEnumerated( keyCondition, keyCMYK );
    list.putEnumerated( keyCondition, keyLab );
    list.putEnumerated( keyCondition, keyMultichannel );
    descSource.putList( keySourceMode, list );
    var keyDestination = charIDToTypeID( "DstM" );
    var descDest = new ActionDescriptor();
    var keyCMYK = charIDToTypeID( "UCMY" );
    descSource.putObject( keyDestination, keyRGB, descDest );
    executeAction( eventModeChange, descSource, DialogModes.NO );
  }
  
  
  //////////////////////////////////////////////
  //////////////////////////////////////////////
  

  Seems to be the engine of the forum swallow the spaces located at random when going advanced editor mode:

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  I recommend you have a look at our examples of Developer Zone and NO community because they have several communications that relate to what you're trying to do.

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