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fix : correct RGB components in grayscale distance calculation in Color.ts #3235

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fix : correct RGB components in grayscale distance calculation in Color.ts #3235

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6 changes: 4 additions & 2 deletions packages/core/src/style/Color.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -204,8 +204,10 @@ function rgbToAnsi256(r: number, g: number, b: number): number {
if (grayIdx < 0) grayIdx = 0;
if (grayIdx > 23) grayIdx = 23;
const grayColor = 232 + grayIdx;
r_c = ANSI256_RGB[grayColor * 3];
const distGray = (r - r_c)**2 + (g - r_c)**2 + (b - r_c)**2;
const r_gray = ANSI256_RGB[grayColor * 3];
const g_gray = ANSI256_RGB[grayColor * 3 + 1];
const b_gray = ANSI256_RGB[grayColor * 3 + 2];
const distGray = (r - r_gray)**2 + (g - g_gray)**2 + (b - b_gray)**2;
if (distGray < bestDist) {
bestDist = distGray;
bestColor = grayColor;
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