Update PngChunkType values to hex

src/ImageSharp/Formats/Png/PngChunkType.cs

@@ -13,48 +13,48 @@ namespace SixLabors.ImageSharp.Formats.Png
         /// common information like the width and the height of the image or
         /// the used compression method.
         /// </summary>
-        Header = 1229472850U,       // IHDR
+        Header = 0x49484452U, // IHDR
 
         /// <summary>
         /// The PLTE chunk contains from 1 to 256 palette entries, each a three byte
         /// series in the RGB format.
         /// </summary>
-        Palette = 1347179589U,      // PLTE
+        Palette = 0x504C5445U, // PLTE
 
         /// <summary>
         /// The IDAT chunk contains the actual image data. The image can contains more
         /// than one chunk of this type. All chunks together are the whole image.
         /// </summary>
-        Data = 1229209940U,         // IDAT
+        Data = 0x49444154U, // IDAT
 
         /// <summary>
         /// This chunk must appear last. It marks the end of the PNG data stream.
         /// The chunk's data field is empty.
         /// </summary>
-        End = 1229278788U,          // IEND
+        End = 0x49454E44U, // IEND
 
         /// <summary>
         /// This chunk specifies that the image uses simple transparency:
         /// either alpha values associated with palette entries (for indexed-color images)
         /// or a single transparent color (for grayscale and true color images).
         /// </summary>
-        PaletteAlpha = 1951551059U, // tRNS
+        PaletteAlpha = 0x74524E53U, // tRNS
 
         /// <summary>
         /// Textual information that the encoder wishes to record with the image can be stored in
         /// tEXt chunks. Each tEXt chunk contains a keyword and a text string.
         /// </summary>
-        Text = 1950701684U,         // tEXt
+        Text = 0x74455874U, // tEXt
 
         /// <summary>
         /// This chunk specifies the relationship between the image samples and the desired
         /// display output intensity.
         /// </summary>
-        Gamma = 1732332865U,        // gAMA
+        Gamma = 0x67414D41U, // gAMA
 
         /// <summary>
         /// The pHYs chunk specifies the intended pixel size or aspect ratio for display of the image.
         /// </summary>
-        Physical = 1883789683U,     // pHYs
+        Physical = 0x70485973U // pHYs
     }
 }