itext pdfimage library

itext_pdfimage/MeasuringExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace itext.pdfimage.Extensions
+{
+    public static class MeasuringExtensions
+    {
+        //72 points == 1
+        //72px x 72px is 1inch x 1inch at a 72dpi resolution
+
+        public static int Dpi { get; set; } = 300;
+
+        public static float PixelsToPoints(this float value, int? dpi = null)
+        {
+            return value / (dpi ?? Dpi) * 72;
+        }
+
+        public static int PointsToPixels(this int value, int? dpi = null)
+        {
+            return PointsToPixels((float)value);
+        }
+
+        public static int PointsToPixels(this float value, int? dpi = null)
+        {
+            return (int)(value * (dpi ?? Dpi) / 72);
+        }
+    }
+}