Brixomatic commented on a change in pull request #114:
URL: https://github.com/apache/commons-imaging/pull/114#discussion_r548983060
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File path: src/main/java/org/apache/commons/imaging/color/ColorConversions.java
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@@ -99,8 +89,8 @@ public static ColorHunterLab convertXYZtoHunterLab(final
ColorXyz xyz) {
public static ColorHunterLab convertXYZtoHunterLab(final double X,
final double Y, final double Z) {
final double L = 10 * Math.sqrt(Y);
- final double a = 17.5 * (((1.02 * X) - Y) / Math.sqrt(Y));
- final double b = 7 * ((Y - (0.847 * Z)) / Math.sqrt(Y));
+ final double a = Y == 0.0 ? 0.0 : 17.5 * (((1.02 * X) - Y) /
Math.sqrt(Y));
+ final double b = Y == 0.0 ? 0.0 : 7 * ((Y - (0.847 * Z)) /
Math.sqrt(Y));
Review comment:
If Y == 0.0 (as with black color) "a" and "b" would become "NaN", this
the same fix that colormine uses (see
[HunterLabConverter.cs](https://github.com/muak/ColorMine/blob/master/ColorMine/ColorSpaces/Conversions/HunterLabConverter.cs)
)
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