def test_upsample(self):
# bluemarble-foreign.tif is a 500 × 250 whole-world map.
dataset = VipsDataset(inputfile=self.foreignfile)
dataset.resample(resolution=None)
self.assertEqual(dataset.RasterXSize, dataset.image.width)
self.assertEqual(dataset.RasterYSize, dataset.image.height)
self.assertEqual(dataset.RasterXSize, 512)
self.assertEqual(dataset.RasterYSize, 512)
def test_upsample(self):
# bluemarble-foreign.tif is a 500 × 250 whole-world map.
dataset = VipsDataset(inputfile=self.foreignfile)
dataset.resample(resolution=None)
self.assertEqual(dataset.RasterXSize, dataset.image.width)
self.assertEqual(dataset.RasterYSize, dataset.image.height)
self.assertEqual(dataset.RasterXSize, 512)
self.assertEqual(dataset.RasterYSize, 512)
def test_downsample(self):
"""
Test that a 258x258 file will get downsampled to
256x256 instead of upsampled to the next resolution.
Because the pixel size is within error tolerance
of the lower resolution's pixel size
"""
dataset = VipsDataset(inputfile=self.slightlytoobigfile)
dataset.resample(resolution=None)
self.assertEqual(dataset.RasterXSize, dataset.image.width)
self.assertEqual(dataset.RasterYSize, dataset.image.height)
self.assertEqual(dataset.RasterXSize, 256)
self.assertEqual(dataset.RasterYSize, 256)
def test_downsample(self):
"""
Test that a 258x258 file will get downsampled to
256x256 instead of upsampled to the next resolution.
Because the pixel size is within error tolerance
of the lower resolution's pixel size
"""
dataset = VipsDataset(inputfile=self.slightlytoobigfile)
dataset.resample(resolution=None)
self.assertEqual(dataset.RasterXSize, dataset.image.width)
self.assertEqual(dataset.RasterYSize, dataset.image.height)
self.assertEqual(dataset.RasterXSize, 256)
self.assertEqual(dataset.RasterYSize, 256)
