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src/color.js

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -364,13 +364,13 @@ class PaletteColorLookupTable {
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]
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const maxInput = Math.max(...maxValues)
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const maxOutput = 255
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// Apply gamma correction to compensate for display gamma (brightens mid-tones)
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// When a linear intensity value i (0 to 1) is looked up, we actually want to look up
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// the color at position i^gamma where gamma = 1/2.2 ≈ 0.4545
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// This pre-brightens the colors for mid-tones
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const gammaInverse = 1.0 / 2.2 // ≈ 0.4545
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const gammaInverse = 1.0 / 2.2 // ≈ 0.4545
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if (this[_attrs].bitsPerEntry === 16 && maxInput > 255) {
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/*
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* Only palettes with 256 entries and 8 bit per entry are supported for
@@ -384,7 +384,7 @@ class PaletteColorLookupTable {
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const normalizedPos = i / (n - 1)
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const gammaCorrectedPos = Math.pow(normalizedPos, gammaInverse)
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const lutIndex = Math.round(gammaCorrectedPos * (this[_attrs].numberOfEntries - 1))
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this[_attrs].data[i] = [
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Math.round(rescale(redLUT[lutIndex], 0, maxInput, 0, maxOutput)),
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Math.round(rescale(greenLUT[lutIndex], 0, maxInput, 0, maxOutput)),
@@ -399,7 +399,7 @@ class PaletteColorLookupTable {
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const normalizedPos = i / (this[_attrs].numberOfEntries - 1)
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const gammaCorrectedPos = Math.pow(normalizedPos, gammaInverse)
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const lutIndex = Math.round(gammaCorrectedPos * (this[_attrs].numberOfEntries - 1))
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this[_attrs].data[i] = [redLUT[lutIndex], greenLUT[lutIndex], blueLUT[lutIndex]]
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}
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}

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