bluwy / colorblind

A zero-dependencies color blindness simulation library

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colorblind's Issues

The data ranges of r,g & b should be greater than 0

target color '#0471BF' to rgb is {r: 4, g: 113, b: 191}.

call simulate({r: 4, g: 113, b: 191}, 'tritanopia'); we get {r: -5.937106516730836, g: 122.83507409286086, b: 122.83507308896952}. r is less than 0;

if we transform the data to hex like

const hexText = `#${((1 << 24) + (Math.round(r) << 16) + (Math.round(g) << 8) + Math.round(b)).toString(16).slice(1)}`;

will get an error result "#a7b7b".

better to set r = Math.max(r, 0); g = Math.max(g, 0); b = Math.max(b, 0) to the convert functions.

ps1: in css of chrome background-color: rgb(-6, 123, 123); equal to background-color: rgb(0, 123, 123)
ps2: I think the matrix from paper of color blind is not so perfect