Add ImageQuality, ImageDPI and DisableSmartShrinking to ConvertOptions

Wkhtmltopdf.NetCore.Test/Options/ConvertOptionsTests.cs

@@ -39,12 +39,15 @@ public void ConvertsAll()
                 PageWidth = AddWithFormat(++counter + 0.5, "--page-width {0}"),
                 IsGrayScale = AddWithValue(true, "-g"),
                 IsLowQuality = AddWithValue(true, "-l"),
+                DisableSmartShrinking = AddWithValue(true, "--disable-smart-shrinking"),
                 Replacements = AddWithValues(new Dictionary<string, string>
                     {
                         {"one", "1"},
                         {"two", "2"}
                     },
-                    new[] {"--replace \"one\" \"1\"", "--replace \"two\" \"2\""})
+                    new[] {"--replace \"one\" \"1\"", "--replace \"two\" \"2\""}),
+                ImageDpi = AddWithFormat(++counter, "--image-dpi {0}"),
+                ImageQuality = AddWithFormat(++counter, "--image-quality {0}")
             };
 
             var result = options.GetConvertOptions();

Wkhtmltopdf.NetCore/Implementation/ConvertOptions.cs

@@ -105,6 +105,24 @@ protected string GetContentType()
         [OptionFlag("--replace")]
         public Dictionary<string, string> Replacements { get; set; }
 
+        /// <summary>
+        /// Sets the compression quality of the images
+        /// </summary>
+        [OptionFlag("--image-quality")]
+        public int? ImageQuality { get; set; }
+
+        /// <summary>
+        /// Sets the dpi of the images
+        /// </summary>
+        [OptionFlag("--image-dpi")]
+        public int? ImageDpi { get; set; }
+
+        /// <summary>
+        /// Disable the intelligent shrinking strategy used by WebKit that makes the pixel/dpi ratio non-constant
+        /// </summary>
+        [OptionFlag("--disable-smart-shrinking")]
+        public bool DisableSmartShrinking { get; set; }
+
         /* <inheritDoc /> */
         public string GetConvertOptions()
         {