Fix quantizer

Former-commit-id: 5b79f56d1d4a7660e65fc63feb0ee9389396571d
Former-commit-id: 119f108657f15b49dc20d6f51bf9f11cb76390ef
Former-commit-id: a07d5756efa4206bf7f974be98014877c14c1159

src/ImageProcessor/Formats/Gif/Quantizer/QuantizedImage.cs

@@ -60,18 +60,18 @@ namespace ImageProcessor.Formats
         /// <returns></returns>
         public Image ToImage()
         {
-            // TODO: Something is going wrong here. We have a palette.
             Image image = new Image();
             int pixelCount = Pixels.Length;
             byte[] bgraPixels = new byte[pixelCount * 4];
 
-            for (int i = 0; i < pixelCount; i += 4)
+            for (int i = 0; i < pixelCount; i++)
             {
+                int j = i * 4;
                 Bgra color = Palette[Pixels[i]];
-                bgraPixels[i + 0] = color.B;
-                bgraPixels[i + 1] = color.G;
-                bgraPixels[i + 2] = color.R;
-                bgraPixels[i + 3] = color.A;
+                bgraPixels[j + 0] = color.B;
+                bgraPixels[j + 1] = color.G;
+                bgraPixels[j + 2] = color.R;
+                bgraPixels[j + 3] = color.A;
             }
 
             image.SetPixels(Width, Height, bgraPixels);

src/ImageProcessor/Formats/Gif/Quantizer/Quantizer.cs

@@ -61,9 +61,11 @@ namespace ImageProcessor.Formats
 
             byte[] quantizedPixels = new byte[width * height];
 
+            List<Bgra> palette = GetPalette();
+
             this.SecondPass(imageBase, quantizedPixels, width, height);
 
-            return new QuantizedImage(width, height, this.GetPalette().ToArray(), quantizedPixels);
+            return new QuantizedImage(width, height, palette.ToArray(), quantizedPixels);
         }
 
         /// <summary>