buildDiffOpts.antialiasingTolerance doesn't seem to be making any difference

[drairi]

Am i doing something wrong here?

My config includes:

module.exports = {
  tolerance: 10,
  buildDiffOpts: {
    antialiasingTolerance: 10
  }
}

My test code includes:

it('Photofeature', function() {
  return this.browser
    .url('https://www.dr.dk/mitliv/martin-er-faldet-en-dvaerg-og-mette-har-giftet-sig-med-en-hjerneskadet')
    .assertView('Photofeature', '.dre-article');
});

I test on Browserstack, and i particularly get problems with Windows 10 Edge. Which looks to me very much like antialiasing problems, but no matter the tolerance or buildDiffOpts.antialiasingTolerance levels i set, i still get the problem.

Am i doing something wrong? Is this actually not an antialiasing problem but an alpha problem?

You can find the images it has produced here:

Baseline:
https://user-images.githubusercontent.com/44468637/65691884-eafebc80-e071-11e9-942c-438cfcc667e7.png

Actual:
https://user-images.githubusercontent.com/44468637/65691893-ef2ada00-e071-11e9-84ef-899338b3651b.png

Diff:
https://user-images.githubusercontent.com/44468637/65691919-f9e56f00-e071-11e9-9483-f853b2b97094.png

Closeup showing problematic pixels:

Why isn't this being resolved by ignoring antialiasing?

Hermione version: 2.12.6

[drairi]

Ah, this is definitely not a hermione bug. I've tried these two images directly with looks-same and the antialiasingTolerance makes no difference. I had to increase tolerance to 20 before it started to pass. I'll raise an issue there.

[drairi]

gemini-testing/looks-same#59