Fix mask/converter.py to show correctly background color. (#547)

CHANGELOG.md

@@ -25,12 +25,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 -
 
 ### Fixed
-- Fixed incorrect width of shapes borders in some cases
-- Fixed annotation parser for tracks with a start frame less than the first segment frame
-- Fixed interpolation on the server near outside frames
-- Fixed dump for case when task name has a slash
-- Fixed auto annotation fail for multijob tasks
-- Fixed installation of CVAT with OpenVINO on the Windows platform
+- Incorrect width of shapes borders in some cases
+- Annotation parser for tracks with a start frame less than the first segment frame
+- Interpolation on the server near outside frames
+- Dump for case when task name has a slash
+- Auto annotation fail for multijob tasks
+- Installation of CVAT with OpenVINO on the Windows platform
+- Background color was always black in utils/mask/converter.py
 
 ### Security
 -

utils/mask/converter.py

@@ -78,7 +78,7 @@ def parse_anno_file(cvat_xml):
     return anno
 
 def create_mask_file(mask_path, width, height, bitness, color_map, background, shapes):
-    mask = np.zeros((height, width, bitness // 8), dtype=np.uint8)
+    mask = np.full((height, width, bitness // 8), background, dtype=np.uint8)
     for shape in shapes:
         color = color_map.get(shape['label'], background)
         points = [tuple(map(float, p.split(','))) for p in shape['points'].split(';')]