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Better scale uint32 images. #1017

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Dec 20, 2022
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Better scale uint32 images. #1017

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
- Better release file handles ([#1007](../../pull/1007))
- Support tiny images from the test source ([#1013](../../pull/1013))
- Speed up loading or parsing some multi sources ([#1015](../../pull/1015))
- Better scale uint32 images ([#1017](../../pull/1017))

### Changes
- Don't report filename in internal PIL metadata ([#1006](../../pull/1006))
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4 changes: 3 additions & 1 deletion large_image/tilesource/utilities.py
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Expand Up @@ -175,7 +175,9 @@ def _imageToPIL(image, setMode=None):
mode = ['L', 'LA', 'RGB', 'RGBA'][image.shape[2] - 1]
if len(image.shape) == 3 and image.shape[2] == 1:
image = numpy.resize(image, image.shape[:2])
if image.dtype == numpy.uint16:
if image.dtype == numpy.uint32:
image = numpy.floor_divide(image, 2 ** 24).astype(numpy.uint8)
elif image.dtype == numpy.uint16:
image = numpy.floor_divide(image, 256).astype(numpy.uint8)
# TODO: The scaling of float data needs to be identical across all
# tiles of an image. This means that we need a reference to the parent
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