diff --git a/sources/zarr/large_image_source_zarr/__init__.py b/sources/zarr/large_image_source_zarr/__init__.py
index 71f0273bd..fe85441ec 100644
--- a/sources/zarr/large_image_source_zarr/__init__.py
+++ b/sources/zarr/large_image_source_zarr/__init__.py
@@ -1,8 +1,12 @@
 import math
 import os
+import shutil
+import tempfile
 import threading
+import uuid
 from importlib.metadata import PackageNotFoundError
 from importlib.metadata import version as _importlib_version
+from pathlib import Path
 
 import numpy as np
 import packaging.version
@@ -10,10 +14,10 @@
 
 import large_image
 from large_image.cache_util import LruCacheMetaclass, methodcache
-from large_image.constants import TILE_FORMAT_NUMPY, SourcePriority
+from large_image.constants import NEW_IMAGE_PATH_FLAG, TILE_FORMAT_NUMPY, SourcePriority
 from large_image.exceptions import TileSourceError, TileSourceFileNotFoundError
 from large_image.tilesource import FileTileSource
-from large_image.tilesource.utilities import nearPowerOfTwo
+from large_image.tilesource.utilities import _imageToNumpy, nearPowerOfTwo
 
 try:
     __version__ = _importlib_version(__name__)
@@ -53,6 +57,13 @@ def __init__(self, path, **kwargs):
         """
         super().__init__(path, **kwargs)
 
+        if str(path).startswith(NEW_IMAGE_PATH_FLAG):
+            self._initNew(path, **kwargs)
+        else:
+            self._initOpen(**kwargs)
+        self._tileLock = threading.RLock()
+
+    def _initOpen(self, **kwargs):
         self._largeImagePath = str(self._getLargeImagePath())
         self._zarr = None
         if not os.path.isfile(self._largeImagePath) and '//:' not in self._largeImagePath:
@@ -80,7 +91,48 @@ def __init__(self, path, **kwargs):
         except Exception:
             msg = 'File cannot be opened -- not an OME NGFF file or understandable zarr file.'
             raise TileSourceError(msg)
-        self._tileLock = threading.RLock()
+
+    def _initNew(self, path, **kwargs):
+        """
+        Initialize the tile class for creating a new image.
+        """
+        self._tempdir = tempfile.TemporaryDirectory(path)
+        self._zarr_store = zarr.DirectoryStore(self._tempdir.name)
+        self._zarr = zarr.open(self._zarr_store, mode='w')
+        # Make unpickleable
+        self._unpickleable = True
+        self._largeImagePath = None
+        self._dims = {}
+        self.sizeX = self.sizeY = self.levels = 0
+        self.tileWidth = self.tileHeight = self._tileSize
+        self._cacheValue = str(uuid.uuid4())
+        self._output = None
+        self._editable = True
+        self._bandRanges = None
+        self._addLock = threading.RLock()
+        self._framecount = 0
+        self._mm_x = 0
+        self._mm_y = 0
+        self._levels = []
+
+    def __del__(self):
+        if not hasattr(self, '_derivedSource'):
+            try:
+                self._zarr.close()
+            except Exception:
+                pass
+            try:
+                shutil.rmtree(self._tempdir)
+            except Exception:
+                pass
+
+    def _checkEditable(self):
+        """
+        Raise an exception if this is not an editable image.
+        """
+        if not self._editable:
+            msg = 'Not an editable image'
+            raise TileSourceError(msg)
 
     def _getGeneralAxes(self, arr):
         """
@@ -284,6 +336,8 @@ def _validateZarr(self):
                 baseArray.shape[self._axes.get('c')] in {1, 3, 4}):
             self._bandCount = baseArray.shape[self._axes['c']]
             self._axes['s'] = self._axes.pop('c')
+        elif 's' in self._axes:
+            self._bandCount = baseArray.shape[self._axes['s']]
         self._zarrFindLevels()
         self._getScale()
         stride = 1
@@ -326,6 +380,13 @@ def getNativeMagnification(self):
             'mm_y': mm_y,
         }
 
+    def getState(self):
+        # Use the _cacheValue to avoid caching the source and tiles if we are
+        # creating something new.
+        if not hasattr(self, '_cacheValue'):
+            return super().getState()
+        return super().getState() + ',%s' % (self._cacheValue, )
+
     def getMetadata(self):
         """
         Return a dictionary of metadata containing levels, sizeX, sizeY,
@@ -333,6 +394,8 @@ def getMetadata(self):
 
         :returns: metadata dictionary.
         """
+        if self._levels is None:
+            self._validateZarr()
         result = super().getMetadata()
         if self._framecount > 1:
             result['frames'] = frames = []
@@ -397,6 +460,9 @@ def _getAssociatedImage(self, imageKey):
 
     @methodcache()
     def getTile(self, x, y, z, pilImageAllowed=False, numpyAllowed=False, **kwargs):
+        if self._levels is None:
+            self._validateZarr()
+
         frame = self._getFrame(**kwargs)
         self._xyzInRange(x, y, z, frame, self._framecount)
         x0, y0, x1, y1, step = self._xyzToCorners(x, y, z)
@@ -439,6 +505,221 @@ def getTile(self, x, y, z, pilImageAllowed=False, numpyAllowed=False, **kwargs):
         return self._outputTile(tile, TILE_FORMAT_NUMPY, x, y, z,
                                 pilImageAllowed, numpyAllowed, **kwargs)
 
+    def addTile(self, tile, x=0, y=0, mask=None, axes=None, **kwargs):
+        """
+        Add a numpy or image tile to the image, expanding the image as needed
+        to accommodate it.  Note that x and y can be negative.  If so, the
+        output image (and internal memory access of the image) will act as if
+        the 0, 0 point is the most negative position.  Cropping is applied
+        after this offset.
+
+        :param tile: a numpy array, PIL Image, or a binary string
+            with an image.  The numpy array can have 2 or 3 dimensions.
+        :param x: location in destination for upper-left corner.
+        :param y: location in destination for upper-left corner.
+        :param mask: a 2-d numpy array (or 3-d if the last dimension is 1).
+            If specified, areas where the mask is false will not be altered.
+        :param axes: a string or list of strings specifying the names of axes
+            in the same order as the tile dimensions
+        :param kwargs: start locations for any additional axes
+        """
+        # TODO: improve band bookkeeping
+
+        self._checkEditable()
+        placement = {
+            'x': x,
+            'y': y,
+            **kwargs,
+        }
+        if not isinstance(tile, np.ndarray) or axes is None:
+            axes = 'yxs'
+            tile, mode = _imageToNumpy(tile)
+        elif not isinstance(axes, str) and not isinstance(axes, list):
+            err = 'Invalid type for axes. Must be str or list[str].'
+            raise ValueError(err)
+        axes = [x.lower() for x in axes]
+        if axes[-1] != 's':
+            axes.append('s')
+        if mask is not None and len(axes) - 1 == len(mask.shape):
+            mask = mask[:, :, np.newaxis]
+        if 'x' not in axes or 'y' not in axes:
+            err = 'Invalid value for axes. Must contain "y" and "x".'
+            raise ValueError(err)
+        for k in placement:
+            if k not in axes:
+                axes[0:0] = [k]
+        with self._addLock:
+            self._axes = {k: i for i, k in enumerate(axes)}
+            while len(tile.shape) < len(axes):
+                tile = np.expand_dims(tile, axis=0)
+            while mask is not None and len(mask.shape) < len(axes):
+                mask = np.expand_dims(mask, axis=0)
+
+            new_dims = {
+                a: max(
+                    self._dims.get(a, 0),
+                    placement.get(a, 0) + tile.shape[i],
+                )
+                for a, i in self._axes.items()
+            }
+            placement_slices = tuple([
+                slice(placement.get(a, 0), placement.get(a, 0) + tile.shape[i], 1)
+                for i, a in enumerate(axes)
+            ])
+
+            current_arrays = dict(self._zarr.arrays())
+            chunking = None
+            if 'root' not in current_arrays:
+                root = np.empty(tuple(new_dims.values()), dtype=tile.dtype)
+                chunking = tuple([
+                    self._tileSize if a in ['x', 'y'] else
+                    new_dims.get('s') if a == 's' else 1
+                    for a in axes
+                ])
+            else:
+                root = current_arrays['root']
+                root.resize(*tuple(new_dims.values()))
+                if root.chunks[-1] != new_dims.get('s'):
+                    # rechunk if length of samples axis changes
+                    chunking = tuple([
+                        self._tileSize if a in ['x', 'y'] else
+                        new_dims.get('s') if a == 's' else 1
+                        for a in axes
+                    ])
+
+            if mask is not None:
+                root[placement_slices] = np.where(mask, tile, root[placement_slices])
+            else:
+                root[placement_slices] = tile
+            if chunking:
+                self._zarr.create_dataset('root', data=root[:], chunks=chunking, overwrite=True)
+
+            # Edit OME metadata
+            self._zarr.attrs.update({
+                'multiscales': [{
+                    'version': '0.5-dev',
+                    'axes': [{
+                        'name': a,
+                        'type': 'space' if a in ['x', 'y'] else 'other',
+                    } for a in axes],
+                    'datasets': [{'path': 0}],
+                }],
+                'omero': {'version': '0.5-dev'},
+            })
+
+            # Edit large_image attributes
+            self._dims = new_dims
+            self._dtype = tile.dtype
+            self._bandCount = new_dims.get(axes[-1])  # last axis is assumed to be bands
+            self.sizeX = new_dims.get('x')
+            self.sizeY = new_dims.get('y')
+            self._framecount = np.prod([
+                length
+                for axis, length in new_dims.items()
+                if axis in axes[:-3]
+            ])
+            self._cacheValue = str(uuid.uuid4())
+            self._levels = None
+            self.levels = int(max(1, math.ceil(math.log(max(
+                self.sizeX / self.tileWidth, self.sizeY / self.tileHeight)) / math.log(2)) + 1))
+
+    @property
+    def crop(self):
+        """
+        Crop only applies to the output file, not the internal data access.
+
+        It consists of x, y, w, h in pixels.
+        """
+        return getattr(self, '_crop', None)
+
+    @crop.setter
+    def crop(self, value):
+        self._checkEditable()
+        if value is None:
+            self._crop = None
+            return
+        x, y, w, h = value
+        x = int(x)
+        y = int(y)
+        w = int(w)
+        h = int(h)
+        if x < 0 or y < 0 or w <= 0 or h <= 0:
+            msg = 'Crop must have non-negative x, y and positive w, h'
+            raise TileSourceError(msg)
+        self._crop = (x, y, w, h)
+
+    def write(
+        self,
+        path,
+        lossy=True,
+        alpha=True,
+        overwriteAllowed=True,
+    ):
+        """
+        Output the current image to a file.
+
+        :param path: output path.
+        :param lossy: if false, emit a lossless file.
+        :param alpha: True if an alpha channel is allowed.
+        :param overwriteAllowed: if False, raise an exception if the output
+            path exists.
+        """
+        if os.path.exists(path):
+            if overwriteAllowed:
+                if os.path.isdir(path):
+                    shutil.rmtree(path)
+                else:
+                    os.remove(path)
+            else:
+                raise TileSourceError('Output path exists (%s).' % str(path))
+
+        # TODO: compute half, quarter, etc. resolutions
+        self._validateZarr()
+        suffix = Path(path).suffix
+        data_dir = self._tempdir
+        data_store = self._zarr_store
+
+        if self.crop:
+            x, y, w, h = self.crop
+            current_arrays = dict(self._zarr.arrays())
+            # create new temp storage for cropped data
+            data_dir = tempfile.TemporaryDirectory()
+            data_store = zarr.DirectoryStore(data_dir.name)
+            cropped_zarr = zarr.open(data_store, mode='w')
+            for arr_name in current_arrays:
+                arr = np.array(current_arrays[arr_name])
+                cropped_arr = arr.take(
+                    indices=range(x, x + w),
+                    axis=self._axes.get('x'),
+                ).take(
+                    indices=range(y, y + h),
+                    axis=self._axes.get('y'),
+                )
+                cropped_zarr.create_dataset(arr_name, data=cropped_arr, overwrite=True)
+                cropped_zarr.attrs.update(self._zarr.attrs)
+
+        if suffix == '.zarr':
+            shutil.copytree(data_dir.name, path)
+
+        elif suffix in ['.db', '.sqlite']:
+            sqlite_store = zarr.SQLiteStore(path)
+            zarr.copy_store(data_store, sqlite_store, if_exists='replace')
+            sqlite_store.close()
+
+        elif suffix == '.zip':
+            zip_store = zarr.ZipStore(path)
+            zarr.copy_store(data_store, zip_store, if_exists='replace')
+            zip_store.close()
+
+        else:
+            from large_image_converter import convert
+
+            attrs_path = Path(data_dir.name) / '.zattrs'
+            convert(str(attrs_path), path, overwrite=overwriteAllowed)
+
+        if self.crop:
+            shutil.rmtree(data_dir.name)
+
 
 def open(*args, **kwargs):
     """
@@ -452,3 +733,11 @@ def canRead(*args, **kwargs):
     Check if an input can be read by the module class.
     """
     return ZarrFileTileSource.canRead(*args, **kwargs)
+
+
+def new(*args, **kwargs):
+    """
+    Create a new image, collecting the results from patches of numpy arrays or
+    smaller images.
+    """
+    return ZarrFileTileSource(NEW_IMAGE_PATH_FLAG + str(uuid.uuid4()), *args, **kwargs)
diff --git a/test/test_examples.py b/test/test_examples.py
index b6801b327..07d464124 100644
--- a/test/test_examples.py
+++ b/test/test_examples.py
@@ -85,8 +85,8 @@ def test_sum_squares_import():
 
 @pytest.mark.parametrize(('sink', 'outname', 'openpath'), [
     ('multivips', 'sample', 'sample/results.yml'),
-    # ('zarr', 'sample.zip', 'sample.zip'),
-    # ('multizarr', 'sample', 'sample/results.yml'),
+    ('zarr', 'sample.zip', 'sample.zip'),
+    ('multizarr', 'sample', 'sample/results.yml'),
 ])
 def test_algorithm_progression(sink, outname, openpath, tmp_path):
     import large_image
diff --git a/test/test_sink.py b/test/test_sink.py
index 316a2c3ea..f6bccf26c 100644
--- a/test/test_sink.py
+++ b/test/test_sink.py
@@ -1,195 +1,179 @@
-import pathlib
-import random
-import tempfile
 
+import large_image_source_test
+import large_image_source_zarr
 import numpy as np
 import pytest
 
 import large_image
 
-possible_axes = {
-    'x': [1, 10],
-    'y': [1, 10],
-    'c': [1, 40],
-    'z': [1, 40],
-    't': [1, 40],
-    'p': [1, 20],
-    'q': [1, 20],
-    's': [3, 3],
-}
-
-include_axes = {
-    'c': False,
-    'z': False,
-    't': False,
-    'p': False,
-    'q': False,
-}
-
-possible_data_ranges = [
-    [0, 1, 2, float],
-    [0, 1, 2, np.float16],
-    [0, 1, 2, np.float32],
-    [0, 1, 2, np.float64],
-    [0, 2**8, -1, np.uint8],
-    [0, 2**8, -1, float],
-    [0, 2**8, -1, int],
-    [0, 2**16, -2, np.uint16],
-    [0, 2**16, -2, float],
-    [0, 2**32, -4, int],
-    [-2**7, 2**7, -1, np.int8],
-    [-2**7, 2**7, -1, float],
-    [-2**7, 2**7, -1, int],
-    [-2**15, 2**15, -2, np.int16],
-    [-2**15, 2**15, -2, float],
-    [-2**15, 2**15, -2, int],
-    [-2**31, 2**31, -4, np.int32],
-    [-2**31, 2**31, -4, float],
-    [-2**31, 2**31, -4, int],
-    [-1, 1, 2, float],
-    [-1, 1, 2, np.float16],
-    [-1, 1, 2, np.float32],
-    [-1, 1, 2, np.float64],
+TMP_DIR = 'tmp/zarr_sink'
+FILE_TYPES = [
+    'tiff',
+    'sqlite',
+    'db',
+    'zip',
+    'zarr',
+    # "dz",
+    # 'svi',
+    # 'svs',
 ]
 
-max_tile_size = 100
-tile_overlap_ratio = 0.5
-
-
-# https://stackoverflow.com/questions/18915378/rounding-to-significant-figures-in-numpy
-def signif(x, minval, maxval, digits):
-    if x == 0:
-        return 0
-    return max(min(round(x, digits), max(1, maxval - 1)), minval)
-
-
-def get_dims(x, y, s, max=False):
-    tile_shape = [x, y]
-    for axis_name, include in include_axes.items():
-        if include:
-            axis_min_max = possible_axes[axis_name]
-            if max:
-                tile_shape.append(axis_min_max[1])
-            else:
-                tile_shape.append(random.randint(*axis_min_max))
-    # s is last axis
-    tile_shape.append(s)
-    return tile_shape
-
-
-def random_tile(data_range):
-    tile_shape = get_dims(
-        random.randint(1, max_tile_size),
-        random.randint(1, max_tile_size),
-        random.randint(*possible_axes['s']),
-        include_axes,
+
+def copyFromSource(source, sink):
+    metadata = source.getMetadata()
+    for frame in metadata.get('frames', []):
+        for tile in source.tileIterator(frame=frame['Frame'], format='numpy'):
+            t = tile['tile']
+            x, y = tile['x'], tile['y']
+            kwargs = {
+                'z': frame['IndexZ'],
+                'c': frame['IndexC'],
+            }
+            sink.addTile(t, x=x, y=y, **kwargs)
+
+
+def testNew():
+    sink = large_image_source_zarr.new()
+    assert sink.metadata['levels'] == 0
+    assert sink.getRegion(format='numpy')[0].shape[:2] == (0, 0)
+
+
+def testBasicAddTile():
+    sink = large_image_source_zarr.new()
+    sink.addTile(np.random.random((10, 10)), 0, 0)
+    sink.addTile(np.random.random((10, 10, 2)), 10, 0)
+
+    metadata = sink.getMetadata()
+    assert metadata.get('levels') == 1
+    assert metadata.get('sizeX') == 20
+    assert metadata.get('sizeY') == 10
+    assert metadata.get('bandCount') == 2
+    assert metadata.get('dtype') == 'float64'
+
+
+def testAddTileWithMask():
+    sink = large_image_source_zarr.new()
+    tile0 = np.random.random((10, 10))
+    sink.addTile(tile0, 0, 0)
+    orig = sink.getRegion(format='numpy')[0]
+    tile1 = np.random.random((10, 10))
+    sink.addTile(tile1, 0, 0, mask=np.random.random((10, 10)) > 0.5)
+    cur = sink.getRegion(format='numpy')[0]
+    assert (tile0 == orig[:, :, 0]).all()
+    assert not (tile1 == orig[:, :, 0]).all()
+    assert not (tile0 == cur[:, :, 0]).all()
+    assert not (tile1 == cur[:, :, 0]).all()
+
+
+def testExtraAxis():
+    sink = large_image_source_zarr.new()
+    sink.addTile(np.random.random((256, 256)), 0, 0, z=1)
+    metadata = sink.getMetadata()
+    assert metadata.get('bandCount') == 1
+    assert len(metadata.get('frames')) == 2
+
+
+@pytest.mark.parametrize('file_type', FILE_TYPES)
+def testCrop(file_type, tmp_path):
+    output_file = tmp_path / f'test.{file_type}'
+    sink = large_image_source_zarr.new()
+
+    # add tiles with some overlap
+    sink.addTile(np.random.random((10, 10)), 0, 0)
+    sink.addTile(np.random.random((10, 10)), 8, 0)
+    sink.addTile(np.random.random((10, 10)), 0, 8)
+    sink.addTile(np.random.random((10, 10)), 8, 8)
+
+    region, _ = sink.getRegion(format='numpy')
+    shape = region.shape
+    assert shape == (18, 18, 1)
+
+    sink.crop = (2, 2, 10, 10)
+
+    # crop only applies when using write
+    sink.write(output_file)
+    if file_type == 'zarr':
+        output_file /= '.zattrs'
+    written = large_image.open(output_file)
+    region, _ = written.getRegion(format='numpy')
+    shape = region.shape
+    assert shape == (10, 10, 1)
+
+
+@pytest.mark.parametrize('file_type', FILE_TYPES)
+def testImageCopySmall(file_type, tmp_path):
+    output_file = tmp_path / f'test.{file_type}'
+    sink = large_image_source_zarr.new()
+    source = large_image_source_test.TestTileSource(
+        fractal=True,
+        tileWidth=128,
+        tileHeight=128,
+        sizeX=512,
+        sizeY=1024,
+        frames='c=2,z=3',
+    )
+    copyFromSource(source, sink)
+
+    metadata = sink.getMetadata()
+    assert metadata.get('sizeX') == 512
+    assert metadata.get('sizeY') == 1024
+    assert metadata.get('dtype') == 'uint8'
+    assert metadata.get('levels') == 2
+    assert metadata.get('bandCount') == 3
+    assert len(metadata.get('frames')) == 6
+
+    # TODO: fix these failures; unexpected metadata when reading it back
+    sink.write(output_file)
+    if file_type == 'zarr':
+        output_file /= '.zattrs'
+    written = large_image.open(output_file)
+    new_metadata = written.metadata
+
+    assert new_metadata.get('sizeX') == 512
+    assert new_metadata.get('sizeY') == 1024
+    assert new_metadata.get('dtype') == 'uint8'
+    assert new_metadata.get('levels') == 2 or new_metadata.get('levels') == 3
+    assert new_metadata.get('bandCount') == 3
+    assert len(new_metadata.get('frames')) == 6
+
+
+@pytest.mark.parametrize('file_type', FILE_TYPES)
+def testImageCopySmallMultiband(file_type, tmp_path):
+    output_file = tmp_path / f'test.{file_type}'
+    sink = large_image_source_zarr.new()
+    bands = (
+        'red=400-12000,green=0-65535,blue=800-4000,'
+        'ir1=200-24000,ir2=200-22000,gray=100-10000,other=0-65535'
     )
-    tile = np.random.rand(*tile_shape)
-    tile *= (data_range[1] - data_range[0])
-    tile += data_range[0]
-    tile = tile.astype(data_range[3])  # apply dtype
-    mask = np.random.randint(2, size=tile_shape[:-1])
-    return (tile, mask)
-
-
-def frame_with_zeros(data, desired_size, start_location=None):
-    if len(desired_size) == 0:
-        return data
-    if not start_location or len(start_location) == 0:
-        start_location = [0]
-    framed = [
-        frame_with_zeros(
-            data[x - start_location[0]],
-            desired_size[1:],
-            start_location=start_location[1:],
-        )
-        if (  # frame with zeros if x>=start and x<start+length
-            x >= start_location[0] and
-            x < data.shape[0] + start_location[0]
-        )  # fill with zeros otherwise
-        else np.zeros(desired_size[1:])
-        for x in range(desired_size[0])
-    ]
-    return np.array(framed)
-
-
-@pytest.mark.parametrize('data_range', possible_data_ranges)
-def testImageGeneration(data_range):
-    source = large_image.new()
-    tile_grid = [
-        int(random.randint(*possible_axes['x'])),
-        int(random.randint(*possible_axes['y'])),
-    ]
-    if data_range is None:
-        data_range = random.choice(possible_data_ranges)
-
-    # create comparison matrix at max size and fill with zeros
-    expected_shape = get_dims(
-        tile_grid[1] * max_tile_size, tile_grid[0] * max_tile_size, 4, True,
+    source = large_image_source_test.TestTileSource(
+        fractal=True,
+        tileWidth=128,
+        tileHeight=128,
+        sizeX=512,
+        sizeY=1024,
+        frames='c=2,z=3',
+        bands=bands,
     )
-    expected = np.ndarray(expected_shape)
-    expected.fill(0)
-    max_x, max_y = 0, 0
-
-    print(
-        f'placing {tile_grid[0] * tile_grid[1]} random tiles in available space: {expected_shape}')
-    print('tile overlap ratio:', tile_overlap_ratio)
-    print('data range:', data_range)
-    for x in range(tile_grid[0]):
-        for y in range(tile_grid[1]):
-            start_location = [
-                int(x * max_tile_size * tile_overlap_ratio),
-                int(y * max_tile_size * tile_overlap_ratio),
-            ]
-            tile, mask = random_tile(data_range)
-            tile_shape = tile.shape
-            source.addTile(tile, *start_location, mask=mask)
-            max_x = max(max_x, start_location[1] + tile_shape[0])
-            max_y = max(max_y, start_location[0] + tile_shape[1])
-
-            framed_tile = np.array(frame_with_zeros(
-                tile,
-                expected.shape,
-                start_location=start_location[::-1],
-            ))
-            framed_mask = np.array(frame_with_zeros(
-                mask.repeat(tile_shape[-1], -1).reshape(tile_shape),
-                expected.shape,
-                start_location=start_location[::-1],
-            ))
-
-            np.putmask(expected, framed_mask, framed_tile)
-
-    with tempfile.TemporaryDirectory() as tmp_dir:
-        # TODO: make destination use mdf5 extension
-        destination = pathlib.Path(tmp_dir, 'sample.tiff')
-        source.write(destination, lossy=False)
-        result, _ = source.getRegion(format='numpy')
-
-    # trim unused space from expected
-    expected = expected[:max_x, :max_y]
-
-    # round to specified precision
-    precision_vector = np.vectorize(signif)
-    expected = precision_vector(expected, data_range[0], data_range[1], data_range[2])
-    result = precision_vector(result, data_range[0], data_range[1], data_range[2])
-
-    # ignore alpha values for now
-    expected = expected.take(indices=range(-1), axis=-1)
-    result = result.take(indices=range(-1), axis=-1)
-
-    # For debugging
-    # difference = numpy.subtract(result, expected)
-    # print(difference)
-    # print(expected[numpy.nonzero(difference)])
-    # print(result[numpy.nonzero(difference)])
-
-    assert np.array_equal(result, expected)
-    # resultFromFile, _ = large_image.open(destination).getRegion(format='numpy')
-    # print(resultFromFile.shape, result.shape)
-    # assert numpy.array_equal(result, resultFromFile)
-    print(f'Success; result matrix {result.shape} equals expected matrix {expected.shape}.')
-
-
-if __name__ == '__main__':
-    testImageGeneration(None)
+    copyFromSource(source, sink)
+
+    metadata = sink.getMetadata()
+    assert metadata.get('sizeX') == 512
+    assert metadata.get('sizeY') == 1024
+    assert metadata.get('dtype') == 'uint16'
+    assert metadata.get('levels') == 2
+    assert metadata.get('bandCount') == 7
+    assert len(metadata.get('frames')) == 6
+
+    # TODO: fix these failures; unexpected metadata when reading it back
+    sink.write(output_file)
+    if file_type == 'zarr':
+        output_file /= '.zattrs'
+    written = large_image.open(output_file)
+    new_metadata = written.getMetadata()
+
+    assert new_metadata.get('sizeX') == 512
+    assert new_metadata.get('sizeY') == 1024
+    assert new_metadata.get('dtype') == 'uint16'
+    assert new_metadata.get('levels') == 2 or new_metadata.get('levels') == 3
+    assert new_metadata.get('bandCount') == 7
+    assert len(new_metadata.get('frames')) == 6