PNG格式的印章不处理背景透明，避免印章质量变差

Author: flytkgl

PDFQFZ/Form1.cs

@@ -373,8 +373,13 @@ private void pdfGz()
                 }
 
                 imgYz = new Bitmap(imgPath);
-                //默认把印章的白色部分重置为透明
-                imgYz = SetWhiteToTransparent(imgYz);
+                //判断印章图片是否PNG格式
+                if (!imgYz.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Png))
+                {
+                    //如果不是PNG格式,则把白色部分设置为透明
+                    imgYz = SetWhiteToTransparent(imgYz);
+                }
+                
                 //再判断是否需要调整整体的透明度
                 if (opacity < 100)
                 {

PDFQFZ/PDFQFZ.csproj

@@ -74,9 +74,8 @@
     <StartupObject>PDFQFZ.Program</StartupObject>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="O2S.Components.PDFRender4NET, Version=4.5.1.2, Culture=neutral, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>F:\Downloads\O2S.Components.PDFRender4NET.dll</HintPath>
+    <Reference Include="O2S.Components.PDFRender4NET">
+      <HintPath>..\..\..\..\..\Downloads\O2S.Components.PDFRender4NET.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Data" />