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Switch color comparison space #9

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Switch color comparison space #9

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5cbab56
Switch color comparison space
SimonDMC Jun 11, 2022
c04fd4e
Remove redundant logging
SimonDMC Jun 11, 2022
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25 changes: 18 additions & 7 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -178,7 +178,23 @@ function updateSteps() {
}



/**
* https://gist.github.com/ryancat/9972419b2a78f329ce3aebb7f1a09152
*
* Compare color difference in RGB
* @param {Array} rgb1 First RGB color in array
* @param {Array} rgb2 Second RGB color in array
*/
function deltaRgb (rgb1, rgb2) {
const [ r1, g1, b1 ] = rgb1,
[ r2, g2, b2 ] = rgb2,
drp2 = Math.pow(r1 - r2, 2),
dgp2 = Math.pow(g1 - g2, 2),
dbp2 = Math.pow(b1 - b2, 2),
t = (r1 + r2) / 2

return (256*3) - Math.sqrt(2 * drp2 + 4 * dgp2 + 3 * dbp2 + t * (drp2 - dbp2) / 256);
}


/* block generation */
Expand All @@ -200,14 +216,9 @@ function genBlocks() {
for (let blockCount = blockData.length -1; blockCount >= 0; ) {
let currentBlock = blockData[blockCount];

/* count similarity for Red, Green and Blue */
var calcR = ( 255 - Math.abs(currentStep[0] - currentBlock.rgb[0]) ) / 255,
calcG = ( 255 - Math.abs(currentStep[1] - currentBlock.rgb[1]) ) / 255,
calcB = ( 255 - Math.abs(currentStep[2] - currentBlock.rgb[2]) ) / 255;

/* 0.0 means 'completely opposite colour', 1.0 means 'same colour';
values <0.8 in 99% of cases are junk */
var currentComparison = [currentBlock.id, (calcR + calcG + calcB) / 3];
var currentComparison = [currentBlock.id, deltaRgb(currentStep, currentBlock.rgb)];

blockCount -= 1;

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