I achieved a ~2x performance improvement by removing the UIColor overhead. We now encode a color within a single double. For example, a color with RGB (255,17,112) would be represented as 25517112. We then parse out the individual components with modular arithmetic and compute our color functions on these components.

Other changes:

• Introduce UIImageColorsQuality enum instead of asking user to provide scale down size
• Change the Playground example project to an iOS app example (check it out on your iPhone, it's beautiful)
• Change album art example to paintings
• Other minor Swift 4 changes

As this is a big change to the library, I am incrementing the version to 2.0.0. I have tested this version on my own projects and it works well. However, due to how experimental this is, I won't be merging this PR until enough people test it.

You can test this on the branch performance-improvement. If you test this and it works well, please give a thumbs up else provide feedback.

Thanks ✌️