internal constructor to public constructor

src/ImageSharp/Formats/PixelTypeInfo.cs

@@ -16,7 +16,7 @@ namespace SixLabors.ImageSharp.Formats
         /// </summary>
         /// <param name="bitsPerPixel">Color depth, in number of bits per pixel.</param>
         /// <param name="alpha">Tthe pixel alpha transparency behavior.</param>
-        internal PixelTypeInfo(int bitsPerPixel, PixelAlphaRepresentation? alpha = null)
+        public PixelTypeInfo(int bitsPerPixel, PixelAlphaRepresentation? alpha = null)
         {
             this.BitsPerPixel = bitsPerPixel;
             this.AlphaRepresentation = alpha;

src/ImageSharp/Metadata/ImageMetadata.cs

@@ -39,7 +39,7 @@ namespace SixLabors.ImageSharp.Metadata
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageMetadata"/> class.
         /// </summary>
-        internal ImageMetadata()
+        public ImageMetadata()
         {
             this.horizontalResolution = DefaultHorizontalResolution;
             this.verticalResolution = DefaultVerticalResolution;