How to make a canvas enlargement macro for all photos?

Question

Adobe Photoshop

Hello! Maybe someone knows how to make a macro in Photoshop so that the size of the canvas from below increases by 170px on all images?

Answer 1

var uMargin = new UnitValue("170 pixels");
var dir = new Folder("D:\\ImagesFolder");

app.playbackDisplayDialogs = DialogModes.NO;

if (dir != null) {
  var fileList = dir.getFiles("*.jpg");
  for (var i = 0; i < fileList.length; i++) { 
    try {
      open( fileList[i] );
      app.activeDocument.resizeCanvas(app.activeDocument.width,app.activeDocument.height+uMargin,AnchorPosition.TOPCENTER);
      app.activeDocument.save(SaveOptions.SAVECHANGES);		
      app.activeDocument.close();		
    }
    catch(e) {
      // бла-бла
    }
  }
}