Add Traingle to ImageHelper

MarketData/MarketDataLib/CNNProcessing/BitmapExtensions.cs

@@ -10,9 +10,14 @@ namespace MarketData.CNNProcessing
 {
 	public static class BitmapExtensions
 	{
-// This call is used to generate the training, test, and validation bitmaps..  
+// This call is used to generate the CNN training, test, and validation bitmaps..  
 // I noticed a large difference in the accuracy or the model when the quality parameter is 100.
 // I therefore intentionally not using EncoderParameters to specify quality but instead taking the default quality.
+      /// <summary>
+      /// Save JPG encoded bitmap
+      /// </summary>
+      /// <param name="bitmap"></param>
+      /// <param name="filename"></param>
 			public static void SaveJPG100(this SKBitmap bitmap, string filename)
 			{       
 			  if(File.Exists(filename))File.Delete(filename);
@@ -22,11 +27,42 @@ namespace MarketData.CNNProcessing
 				encodedImage.SaveTo(stream);		
 			}
 
+      /// <summary>
+      /// Save JPG encoded bitmap
+      /// </summary>
+      /// <param name="bitmap"></param>
+      /// <param name="stream"></param>
 			public static void SaveJPG100(this SKBitmap bitmap, Stream stream)
 			{
 				using SKImage image = SKImage.FromBitmap(bitmap); 
 				using SKData encodedImage = image.Encode(SKEncodedImageFormat.Jpeg,100);
 				encodedImage.SaveTo(stream);			
 			}
+
+      /// <summary>
+      /// Save PNG encoded bitmap
+      /// </summary>
+      /// <param name="bitmap"></param>
+      /// <param name="filename"></param>
+			public static void SavePNG100(this SKBitmap bitmap, string filename)
+			{       
+			  if(File.Exists(filename))File.Delete(filename);
+				using FileStream stream = new FileStream(filename, FileMode.Create, FileAccess.Write);
+				using SKImage image = SKImage.FromBitmap(bitmap); 
+				using SKData encodedImage = image.Encode(SKEncodedImageFormat.Png,100);
+				encodedImage.SaveTo(stream);		
+			}
+
+      /// <summary>
+      /// Save PNG encoded bitmap
+      /// </summary>
+      /// <param name="bitmap"></param>
+      /// <param name="stream"></param>
+			public static void SavePNG100(this SKBitmap bitmap, Stream stream)
+			{
+				using SKImage image = SKImage.FromBitmap(bitmap); 
+				using SKData encodedImage = image.Encode(SKEncodedImageFormat.Png,100);
+				encodedImage.SaveTo(stream);			
+			}      
 	}
 }