Author: tilman
Date: Tue Sep 15 06:43:28 2026
New Revision: 1938228
Log:
PDFBOX-6264: improve clamp test; add toRGB() test by ChatGPT
Modified:
pdfbox/branches/2.0/pdfbox/src/test/java/org/apache/pdfbox/pdmodel/graphics/color/PDLabTest.java
Modified:
pdfbox/branches/2.0/pdfbox/src/test/java/org/apache/pdfbox/pdmodel/graphics/color/PDLabTest.java
==============================================================================
---
pdfbox/branches/2.0/pdfbox/src/test/java/org/apache/pdfbox/pdmodel/graphics/color/PDLabTest.java
Tue Sep 15 06:43:25 2026 (r1938227)
+++
pdfbox/branches/2.0/pdfbox/src/test/java/org/apache/pdfbox/pdmodel/graphics/color/PDLabTest.java
Tue Sep 15 06:43:28 2026 (r1938228)
@@ -15,8 +15,10 @@
*/
package org.apache.pdfbox.pdmodel.graphics.color;
+import java.io.IOException;
import java.util.Arrays;
+import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
@@ -99,6 +101,12 @@ public class PDLabTest
public void testClamp()
{
PDLab lab = new PDLab();
+ assertEquals(-100, lab.getARange().getMin(), 0f);
+ assertEquals(100, lab.getARange().getMax(), 0f);
+ assertEquals(-100, lab.getBRange().getMin(), 0f);
+ assertEquals(100, lab.getBRange().getMax(), 0f);
+ assertEquals("[0.0, 100.0, -100.0, 100.0, -100.0, 100.0]",
+ Arrays.toString(lab.getDefaultDecode(1)));
PDRange aRange = new PDRange();
aRange.setMin(-160);
aRange.setMax(160);
@@ -123,4 +131,30 @@ public class PDLabTest
assertEquals("[100.0, 160.0, 160.0]", Arrays.toString(lab4));
assertEquals("[100.0, 160.0, 160.0]", Arrays.toString(lab5));
}
+
+ @Test
+ public void testToRGB() throws IOException
+ {
+ // Author: ChatGPT
+ PDLab lab = new PDLab();
+
+ // PDF Lab values: L* is 0..100, a* and b* are -100..100.
+ float[] black = lab.toRGB(new float[] { 0, 0, 0 });
+ float[] white = lab.toRGB(new float[] { 100, 0, 0 });
+ float[] red = lab.toRGB(new float[] { 53, 80, 67 });
+
+ // Black and white should be at the ends of the RGB range.
+ assertArrayEquals(new float[] { 0, 0, 0 }, black, 0.01f);
+ assertArrayEquals(new float[] { 1, 1, 1 }, white, 0.02f);
+
+ // Red should have a higher red component than green and blue.
+ assertTrue(red[0] > red[1]);
+ assertTrue(red[0] > red[2]);
+
+ // All RGB components must be in the valid range.
+ for (float component : red)
+ {
+ assertTrue(component >= 0 && component <= 1);
+ }
+ }
}
