Fix pyramid level rounding error

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased] -
 
+## [0.13.2] - 2024-09-06
+
+### Fixed
+
+- Rounding error when calculating level pyramid index if downsampled image size was rounded up.
+
 ## [0.13.1] - 2024-07-01
 
 ### Fixed
@@ -213,7 +219,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial release of opentile.
 
-[Unreleased]: https://github.com/imi-bigpicture/opentile/compare/v0.13.1..HEAD
+[Unreleased]: https://github.com/imi-bigpicture/opentile/compare/v0.13.2..HEAD
+[0.13.2]: https://github.com/imi-bigpicture/opentile/compare/v0.13.1..v0.13.2
 [0.13.1]: https://github.com/imi-bigpicture/opentile/compare/v0.13.0..v0.13.1
 [0.13.0]: https://github.com/imi-bigpicture/opentile/compare/v0.12.0..v0.13.0
 [0.12.0]: https://github.com/imi-bigpicture/opentile/compare/v0.11.2..v0.12.0

opentile/__init__.py

@@ -17,4 +17,4 @@
 from opentile.opentile import OpenTile
 from opentile.metadata import Metadata
 
-__version__ = "0.13.1"
+__version__ = "0.13.2"

opentile/tiff_image.py

@@ -328,7 +328,7 @@ def _calculate_pyramidal_index(
         self,
         base_size: Size,
     ) -> int:
-        return int(math.log2(base_size.width / self.image_size.width))
+        return round(math.log2(base_size.width / self.image_size.width))
 
     def _calculate_mpp(self, base_mpp: SizeMm) -> SizeMm:
         return base_mpp * pow(2, self.pyramid_index)