Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/imageio/plugins/feisem.py

@@ -0,0 +1,91 @@
+# -*- coding: utf-8 -*-
+# imageio is distributed under the terms of the (new) BSD License.
+
+from .tifffile import TiffFormat
+
+from .. import formats
+
+
+class FEISEMFormat(TiffFormat):
+    """Provide read support for TIFFs produced by an FEI SEM microscope.
+
+    This format is based on TIFF, and supports the same parameters.
+
+    FEI microscopes append metadata as ASCII text at the end of the file,
+    which this reader correctly extracts.
+
+    Parameters for get_data
+    -----------------------
+    discard_watermark : bool
+        If True (default), discard the bottom rows of the image, which
+        contain no image data, only a watermark with metadata.
+    watermark_height : int
+        The height in pixels of the FEI watermark. The default is 70.
+    """
+
+    def _can_write(self, request):
+        return False  # FEI-SEM only supports reading
+
+    class Reader(TiffFormat.Reader):
+        def _get_data(self, index=0, discard_watermark=True, watermark_height=70):
+            """Get image and metadata from given index.
+
+            FEI images usually (always?) contain a watermark at the
+            bottom of the image, 70 pixels high. We discard this by
+            default as it does not contain any information not present
+            in the metadata.
+            """
+            im, meta = super(FEISEMFormat.Reader, self)._get_data(index)
+            if discard_watermark:
+                im = im[:-watermark_height]
+            return im, meta
+
+        def _get_meta_data(self, index=None):
+            """Read the metadata from an FEI SEM TIFF.
+
+            This metadata is included as ASCII text at the end of the file.
+
+            The index, if provided, is ignored.
+
+            Returns
+            -------
+            metadata : dict
+                Dictionary of metadata.
+            """
+            md = {"root": {}}
+            current_tag = "root"
+            reading_metadata = False
+            filename = self.request.get_local_filename()
+            with open(filename, encoding="utf8", errors="ignore") as fin:
+                for line in fin:
+                    if not reading_metadata:
+                        if not line.startswith("Date="):
+                            continue
+                        else:
+                            reading_metadata = True
+                    line = line.rstrip()
+                    if line.startswith("["):
+                        current_tag = line.lstrip("[").rstrip("]")
+                        md[current_tag] = {}
+                    else:
+                        if "=" in line:  # ignore empty and irrelevant lines
+                            key, val = line.split("=", maxsplit=1)
+                            for tag_type in (int, float):
+                                try:
+                                    val = tag_type(val)
+                                except ValueError:
+                                    continue
+                                else:
+                                    break
+                            md[current_tag][key] = val
+            if not md["root"] and len(md) == 1:
+                raise ValueError("Input file %s contains no FEI metadata." % filename)
+            self._meta.update(md)
+            return md
+
+
+# Register plugin
+format = FEISEMFormat(
+    "fei", "FEI-SEM TIFF format", extensions=[".tif", ".tiff"], modes="iv"
+)
+formats.add_format(format)