#658: TGAImageReaderSpi now recognizes "true color" images with valid palette depth != 0

(cherry picked from commit b8f2a80ca6209a5d1e9cc1cf5c513b4dc867fad6)

imageio/imageio-tga/src/main/java/com/twelvemonkeys/imageio/plugins/tga/TGAImageReaderSpi.java

@@ -94,8 +94,9 @@ public final class TGAImageReaderSpi extends ImageReaderSpiBase {
             int colorMapDepth = stream.readUnsignedByte();
 
             if (colorMapSize == 0) {
-                // No color map, all 3 fields should be 0
-                if (colorMapStart != 0 || colorMapDepth != 0) {
+                // No color map, all 3 fields should be 0 (but some files contain bogus colorMapDepth)
+                if (colorMapStart != 0 || colorMapDepth != 0
+                        && colorMapDepth != 15 && colorMapDepth != 16 && colorMapDepth != 24 && colorMapDepth != 32)  {
                     return false;
                 }
             }

imageio/imageio-tga/src/test/java/com/twelvemonkeys/imageio/plugins/tga/TGAImageReaderTest.java

@@ -94,7 +94,9 @@ public class TGAImageReaderTest extends ImageReaderAbstractTest<TGAImageReader>
                 new TestData(getClassLoaderResource("/tga/autodesk-3dsmax-extsize494.tga"), new Dimension(440, 200)),  // RLE compressed 32 bit BGRA bottom/up
 
                 new TestData(getClassLoaderResource("/tga/monochrome16_top_left.tga"), new Dimension(64, 64)),  // Uncompressed 16 bit monochrome
-                new TestData(getClassLoaderResource("/tga/monochrome16_top_left_rle.tga"), new Dimension(64, 64))  // RLE compressed 16 bit monochrome
+                new TestData(getClassLoaderResource("/tga/monochrome16_top_left_rle.tga"), new Dimension(64, 64)),  // RLE compressed 16 bit monochrome
+
+                new TestData(getClassLoaderResource("/tga/692c33d1-d0c3-4fe2-a059-f199d063bc7a.tga"), new Dimension(256, 256)) // Uncompressed BGR, with colorMapDepth set to 24
         );
     }