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fix: Fix check for mask IFD #13

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Merged
kylebarron merged 1 commit into from
Jan 27, 2026
Merged

fix: Fix check for mask IFD #13

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8 changes: 5 additions & 3 deletions src/async_geotiff/_geotiff.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,10 @@

from affine import Affine
from async_tiff import TIFF
from async_tiff.enums import PhotometricInterpretation

from async_geotiff._overview import Overview
from async_geotiff.enums import Compression, Interleaving, PhotometricInterp
from async_geotiff.enums import Compression, Interleaving

if TYPE_CHECKING:
import pyproj
Expand Down Expand Up @@ -383,8 +384,9 @@ def is_mask_ifd(ifd: ImageFileDirectory) -> bool:
"""Check if an IFD is a mask IFD."""
if (
ifd.compression == Compression.deflate
and ifd.new_subfile_type
and ifd.photometric_interpretation == 4
and ifd.new_subfile_type is not None
and ifd.new_subfile_type & 4 != 0
and ifd.photometric_interpretation == PhotometricInterpretation.TransparencyMask
):
return True

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