// Load a raw Landsat 5 ImageCollection for a single year.
var collection = ee.ImageCollection('LANDSAT/LC08/C01/T1')
.filterBounds(geometry).filterDate('2016-12-01', '2017-02-28');

// Create a cloud-free composite with default parameters.
var composite = ee.Algorithms.Landsat.simpleComposite(collection);

// Create a cloud-free composite with custom parameters for
// cloud score threshold and percentile.
var customComposite = ee.Algorithms.Landsat.simpleComposite({
  collection: collection,
  percentile: 75,
  cloudScoreRange: 5
});

// Export a cloud-optimized GeoTIFF.
Export.image.toDrive({
  image: composite,
  description: 'cloudFreeSpringTRUE',
  scale: 30,
  region: geometry,
  fileFormat: 'GeoTIFF',
  folder: 'Croatia',
});

// Display the composites.
Map.setCenter(18.1166, 42.6509, 10);
Map.addLayer(composite, {bands: ['B3', 'B2', 'B1'], max: 128}, 'Cloud free composite');