Handle bogus gamma correction on new GRAY texturepack images

Author: mikeprimm

DynmapCore/src/main/java/org/dynmap/hdmap/TexturePack.java

@@ -1273,7 +1273,17 @@ private void loadImage(InputStream is, int idx, String fname, String modid) thro
             imgs[idx].width = img.getWidth();
             imgs[idx].height = img.getHeight();
             imgs[idx].argb = new int[imgs[idx].width * imgs[idx].height];
-            img.getRGB(0, 0, imgs[idx].width, imgs[idx].height, imgs[idx].argb, 0, imgs[idx].width);
+            if (img.getType() == BufferedImage.TYPE_BYTE_GRAY) {	// We don't want alpha correction, apparently
+            	float[] buffer = new float[imgs[idx].width * imgs[idx].height];
+    			img.getData().getPixels(0, 0, imgs[idx].width, imgs[idx].height, buffer);
+            	for (int i = 0; i < imgs[idx].argb.length; i++) {
+            		int v = (int) buffer[i];
+            		imgs[idx].argb[i] = 0xFF000000 | (v << 16) | (v << 8) | v;
+            	}
+            }
+            else {
+            	img.getRGB(0, 0, imgs[idx].width, imgs[idx].height, imgs[idx].argb, 0, imgs[idx].width);
+            }
             img.flush();
             imgs[idx].isLoaded = true;
         }