Merge pull request #39 from melissalinkert/float-pixels

Fix sample format tag to preserve floating point pixel type
glencoesoftware · Jul 30, 2020 · ed49988 · ed49988
2 parents 17debd6 + 5dc6fc6
commit ed49988
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/src/main/java/com/glencoesoftware/pyramid/PyramidFromDirectoryWriter.java b/src/main/java/com/glencoesoftware/pyramid/PyramidFromDirectoryWriter.java
@@ -851,7 +851,16 @@ private IFD makeIFD(PyramidSeries s, int resolution, int plane)
     ifd.put(IFD.COMPRESSION, getTIFFCompression().getCode());
 
     ifd.put(IFD.PLANAR_CONFIGURATION, s.rgb ? 2 : 1);
-    ifd.put(IFD.SAMPLE_FORMAT, 1);
+
+    int sampleFormat = 1;
+    if (FormatTools.isFloatingPoint(s.pixelType)) {
+      sampleFormat = 3;
+    }
+    else if (FormatTools.isSigned(s.pixelType)) {
+      sampleFormat = 2;
+    }
+
+    ifd.put(IFD.SAMPLE_FORMAT, sampleFormat);
 
     int[] bps = new int[s.rgb ? s.c : 1];
     Arrays.fill(bps, FormatTools.getBytesPerPixel(s.pixelType) * 8);