[BUG] Similar images are not matched

[MightyEagle82]

Describe the bug There are 2 images to compare:

1. test_with_alpha.png - reference image
2. bc1a_decoded.png - image decoded from DDS file that was produced from the reference image

They are technically similar but the library don't think so (even when pixelToleranceLevel = 0.99 and threshold = 50).

bc1a_result.png - result of comparison

What am I doing wrong?

test_with_alpha.png

bc1a_decoded.png

bc1a_result.png