Improve mechanism that picks the closest color

[willemstuursma]

The mechanism that picked the closest color was pretty naive. It took the sum of the R, G and B distances separately.

This mechanism takes into consideration that the three colors are in are 3-D space and weights R, G and B differently. I took it from Stack Overflow.

Using this source image:

The naive algorithm would generate this image:

The improved algorithm generates this image:

Note that it is less noisy.

[ricardofiorani]

@willemstuursma Sorry I took so long to review your PRs. I tested it with some other images and I really liked the results! Thank you for this 🍻 !

[willemstuursma]

Thanks @ricardofiorani. Most of the improvements come from this line:

$image->resize($amountOfBricksX, $amountOfBricksY);

This causes each brick to have the "average" color of the underlying 16x16 pixels. Before, it would pick the pixel in the top left corner as the brick color.

[willemstuursma]

I really enjoyed working on this for a few hours, thanks for creating the project.