Distance from hash

[hipstersmoothie]

What's Changing and Why

Calculate distanceFromHash

closes #299

What else might be affected

nothing

Tasks

• Add tests
• Update Documentation
• Update jimp.d.ts
• Add SemVer Label

[edi9999]

I think this API could be made even more reusable by allowing to pass two arguments :

something like this :

const hash1 = image1.pHash();
const hash2 = image2.pHash();
compareHashes(hash1, hash2);

This way, if for example you have 100 images and you want to compare them "all together" to remove duplicate or similar images, you have to compute the hashes only once.

Does this make sense ?

I don't know exactly how we can expose this.

[hipstersmoothie]

@edi9999 that makes sense. I have added the compareHashes function/