Special case La32 and L16

src/ImageSharp/Color/Color.Conversions.cs

@@ -34,6 +34,28 @@ namespace SixLabors.ImageSharp
             this.boxedHighPrecisionPixel = null;
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Color"/> struct.
+        /// </summary>
+        /// <param name="pixel">The <see cref="La32"/> containing the color information.</param>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public Color(La32 pixel)
+        {
+            this.data = new Rgba64(pixel.L, pixel.L, pixel.L, pixel.A);
+            this.boxedHighPrecisionPixel = null;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Color"/> struct.
+        /// </summary>
+        /// <param name="pixel">The <see cref="L16"/> containing the color information.</param>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public Color(L16 pixel)
+        {
+            this.data = new Rgba64(pixel.PackedValue, pixel.PackedValue, pixel.PackedValue, ushort.MaxValue);
+            this.boxedHighPrecisionPixel = null;
+        }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="Color"/> struct.
         /// </summary>

src/ImageSharp/Color/Color.cs

@@ -117,6 +117,14 @@ namespace SixLabors.ImageSharp
             {
                 return new((Rgb48)(object)pixel);
             }
+            else if (typeof(TPixel) == typeof(La32))
+            {
+                return new((La32)(object)pixel);
+            }
+            else if (typeof(TPixel) == typeof(L16))
+            {
+                return new((L16)(object)pixel);
+            }
             else if (Unsafe.SizeOf<TPixel>() <= Unsafe.SizeOf<Rgba32>())
             {
                 Rgba32 p = default;