[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

[EPadronU]

Even at a glance, the images are different:

• no blurring (hard edges) vs blurring
• more contrast (less transparency) vs less contrast (more transparency)

Instead of looking for equality, for cases like this one you could look for similarity.

In my humble opinion, this is not a bug.