From Ralf Kern, "the attached color mapped TIFF file klink1_l.tif is incorrectly read as

GL_LUMINANCE data instead of GL_RGB data. You can easily check with
"osgViewer --image klink1_l.tif".

The bug is in ReaderWriterTIFF.cpp function simage_tiff_load, where
numComponents_ret is incorrectly set to 1 instead of 3 for color mapped
data."

src/osgPlugins/tiff/ReaderWriterTIFF.cpp

@@ -616,7 +616,11 @@ simage_tiff_load(std::istream& fin,
     }
     width_ret = width;
     height_ret = height;
-    numComponents_ret = samplesperpixel;
+    if (photometric == PHOTOMETRIC_PALETTE)
+        numComponents_ret = format;
+    else
+        numComponents_ret = samplesperpixel;
+
     return buffer;
 }