Add an option to compression to webp lossless.

girder · Jan 21, 2021 · 7bf2600 · 7bf2600
1 parent fee9ed9
commit 7bf2600
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Showing 3 changed files with 7 additions and 1 deletion.
diff --git a/test/test_converter.py b/test/test_converter.py
@@ -68,6 +68,9 @@ def testIsVips():
     ({'compression': 'lzw', 'predictor': 'yes'}, {
         tifftools.Tag.Compression.value: tifftools.constants.Compression.LZW.value
     }),
+    ({'compression': 'webp', 'quality': 0}, {
+        tifftools.Tag.Compression.value: tifftools.constants.Compression.WEBP.value
+    }),
     ({'tileSize': 512}, {
         tifftools.Tag.TileWidth.value: 512
     }),

diff --git a/utilities/converter/large_image_converter/__init__.py b/utilities/converter/large_image_converter/__init__.py
@@ -559,6 +559,8 @@ def _vips_parameters(forTiled=True, **kwargs):
             convertParams[vkey] = kwargs[kwkey]
     if convertParams['compression'] == 'jp2k':
         convertParams['compression'] = 'none'
+    if convertParams['compression'] == 'webp' and kwargs.get('quality') == 0:
+        convertParams['lossless'] = True
     if convertParams['predictor'] == 'yes':
         convertParams['predictor'] = 'horizontal'
     if convertParams['compression'] == 'jpeg':

diff --git a/utilities/converter/large_image_converter/__main__.py b/utilities/converter/large_image_converter/__main__.py
@@ -34,7 +34,8 @@ def get_parser():
         'compression ratio.')
     parser.add_argument(
         '--quality', '-q', default=90, type=int,
-        help='JPEG compression quality')
+        help='JPEG or webp compression quality.  For webp, specify 0 for '
+        'lossless.')
     parser.add_argument(
         '--level', '-l', type=int,
         help='General compression level.  Used for deflate (zip), zstd, and '