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Relax tolerance for HCOMPRESS_1 tests with quantization #18476

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Relax tolerance for HCOMPRESS_1 tests with quantization #18476

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12 changes: 11 additions & 1 deletion astropy/io/fits/hdu/compressed/tests/test_fitsio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -228,5 +228,15 @@ def test_compress(
# original data, we compare it to the data read in by astropy (as those
# should match)

# Use relaxed tolerances for HCOMPRESS_1 with quantization
if compression_type == "HCOMPRESS_1" and "ZQUANTIZ" in header:
# SUBTRACTIVE_DITHER_2 and other quantization methods can have small precision differences
rtol = 1e-5
atol = 1e-5
else:
# Use default tolerances for other cases
rtol = 1e-7
atol = 0

with fits.open(astropy_compressed_file_path) as hdul:
np.testing.assert_allclose(data, hdul[1].data)
np.testing.assert_allclose(data, hdul[1].data, rtol=rtol, atol=atol)
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