Allow specifying alpha as a number from 0 to 255

[Richienb]

Currently, the alpha can only be specified as a decimal or percentage. However, it would be useful if it could be specified as a number from 0 to 255. Conversion back to percentages is: alpha / 255

const rgbHex = require("rgb-hex")

rgbHex(255, 255, 255, 255)
//=> "ffffffff"

cc @sindresorhus

[sindresorhus]

What's the use-case? I don't see how that can be done with the suggested API as it's ambigious whether rgbHex(255, 255, 255, 1) means 100% alpha or 1/255%.

[Richienb]

@sindresorhus A Uint8ClampedArray encodes red, green, blue and alpha as integers from 0 to 255.

[sindresorhus]

Any suggestions on how the API should look like?

[Richienb]

@sindresorhus We could add an option that changes the behaviour of the alpha parameter.

[sindresorhus]

Yeah, I guess.