Monochrome background character image is converted to a transparent background, and the converted image and the background image after the synthesis output

FiltersDemo
...........\FiltersDemo
...........\FiltersDemo.sln
...........\FiltersDemo.suo
...........\...........\bin
...........\...........\...\Debug
...........\...........\...\.....\2016-03-25_11-38-15.png
...........\...........\...\.....\234.png
...........\...........\...\.....\back.jpg
...........\...........\...\.....\configs.xml
...........\...........\...\.....\configs.xml.bak
...........\...........\...\.....\FiltersDemo.exe
...........\...........\...\.....\FiltersDemo.pdb
...........\...........\...\.....\FiltersDemo.vshost.exe
...........\...........\...\.....\FiltersDemo.vshost.exe.manifest
...........\...........\...\.....\merge.png
...........\...........\...\.....\test.jpg
...........\...........\...\Release
...........\...........\CFG
...........\...........\...\Configs.cs
...........\...........\...\configs.xml
...........\...........\FilterDemo.cs
...........\...........\FilterDemo.Designer.cs
...........\...........\FilterDemo.resx
...........\...........\FiltersDemo.csproj
...........\...........\obj
...........\...........\...\x86
...........\...........\...\...\Debug
...........\...........\...\...\.....\DesignTimeResolveAssemblyReferences.cache
...........\...........\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
...........\...........\...\...\.....\FiltersDemo.csproj.FileListAbsolute.txt
...........\...........\...\...\.....\FiltersDemo.csproj.GenerateResource.Cache
...........\...........\...\...\.....\FiltersDemo.csprojResolveAssemblyReference.cache
...........\...........\...\...\.....\FiltersDemo.exe
...........\...........\...\...\.....\FiltersDemo.FilterDemo.resources
...........\...........\...\...\.....\FiltersDemo.pdb
...........\...........\...\...\.....\FiltersDemo.Properties.Resources.resources
...........\...........\...\...\.....\TempPE
...........\...........\Operator
...........\...........\........\ImageColorSetting.cs
...........\...........\........\RotateImage.cs
...........\...........\........\XSerializer.cs
...........\...........\Program.cs
...........\...........\Properties
...........\...........\..........\AssemblyInfo.cs
...........\...........\..........\Resources.Designer.cs
...........\...........\..........\Resources.resx
...........\...........\..........\Settings.Designer.cs
...........\...........\..........\Settings.settings

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