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trying to make palette preview look close to real LED colors

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FastLED palettes (from palettes.h) use gammas (2.6, 2.2, 2.5). Screens expect un-corrected colors, so we try to revert palette gamma correction in the browser.
This commit is contained in:
Frank
2024-01-28 16:19:16 +01:00
parent 2277d81699
commit a8897203a9
2 changed files with 11 additions and 4 deletions
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13
wled00/data/index.js
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@@ -977,6 +977,11 @@ function redrawPalPrev()
}
}
// WLEDMM experimental - revert gamma correction in the browser (for palette preview)
function unGamma(val, gamma){
return Math.round(Math.pow(val / 255.0, 1.0/gamma) * 255.0);
}
function genPalPrevCss(id)
{
if (!palettesData) return;
@@ -999,15 +1004,17 @@ function genPalPrevCss(id)
let r, g, b;
let index = false;
if (Array.isArray(e)) {
// fastLED palettes, with gammas (2.6, 2.2, 2.5) - we revert with slightly reduced values, to better preserve contrast
index = Math.round(e[0]/255*100);
r = e[1];
g = e[2];
b = e[3];
r = unGamma(e[1], 2.5);
g = unGamma(e[2], 2.3);
b = unGamma(e[3], 2.4);
} else if (e == 'r') {
r = Math.random() * 255;
g = Math.random() * 255;
b = Math.random() * 255;
} else {
// gradient palettes have custom gamma ~2.6 - don't revert, so their look matches the custom colors display
let i = e[1] - 1;
var cd = gId('csl').children;
r = parseInt(cd[i].dataset.r);

2
wled00/wled.h
View File

@@ -8,7 +8,7 @@
*/
// version code in format yymmddb (b = daily build)
#define VERSION 2401260
#define VERSION 2401280
// WLEDMM - you can check for this define in usermods, to only enabled WLEDMM specific code in the "right" fork. Its not defined in AC WLED.
#define _MoonModules_WLED_