Processed review comments, removed ImageFrame.BackgroundColor property.

src/ImageSharp/ImageFrameCollection.cs

@@ -143,7 +143,7 @@ namespace SixLabors.ImageSharp
         /// <inheritdoc/>
         public ImageFrame<TPixel> CreateFrame()
         {
-            var frame = new ImageFrame<TPixel>(this.parent.GetConfiguration(), this.RootFrame.Width, this.RootFrame.Height, this.RootFrame.BackgroundColor);
+            var frame = new ImageFrame<TPixel>(this.parent.GetConfiguration(), this.RootFrame.Width, this.RootFrame.Height, default);
             this.frames.Add(frame);
             return frame;
         }

src/ImageSharp/ImageFrame{TPixel}.cs

@@ -79,7 +79,6 @@ namespace SixLabors.ImageSharp
 
             this.MemoryManager = configuration.MemoryManager;
             this.PixelBuffer = this.MemoryManager.Allocate2D<TPixel>(width, height, false);
-            this.BackgroundColor = backgroundColor;
             this.Clear(configuration.ParallelOptions, backgroundColor);
             this.MetaData = metaData;
         }
@@ -130,11 +129,6 @@ namespace SixLabors.ImageSharp
         /// </summary>
         public int Height => this.PixelBuffer.Height;
 
-        /// <summary>
-        /// Gets the background color.
-        /// </summary>
-        public TPixel BackgroundColor { get; }
-
         /// <summary>
         /// Gets the meta data of the frame.
         /// </summary>