Using C#, you can use the mouse to crop the image to the size needed，just for learning.

ImageShear
..........\ImageClassLib
..........\.............\bin
..........\.............\...\Debug
..........\.............\...\.....\ImageClassLib.dll
..........\.............\...\.....\ImageClassLib.pdb
..........\.............\...\Release
..........\.............\ImageClassLib.csproj
..........\.............\ImageCut.cs
..........\.............\ImageCut1.cs
..........\.............\obj
..........\.............\...\Debug
..........\.............\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..........\.............\...\.....\ImageClassLib.csproj.FileListAbsolute.txt
..........\.............\...\.....\ImageClassLib.dll
..........\.............\...\.....\ImageClassLib.pdb
..........\.............\...\.....\TempPE
..........\.............\Properties
..........\.............\..........\AssemblyInfo.cs
..........\ImageShear
..........\ImageShear.sln
..........\ImageShear.suo
..........\..........\bin
..........\..........\...\Debug
..........\..........\...\.....\ImageClassLib.dll
..........\..........\...\.....\ImageClassLib.pdb
..........\..........\...\.....\ImageShear.exe
..........\..........\...\.....\ImageShear.pdb
..........\..........\...\.....\ImageShear.vshost.exe
..........\..........\...\.....\ImageShear.vshost.exe.manifest
..........\..........\...\Release
..........\..........\Form4.cs
..........\..........\Form4.Designer.cs
..........\..........\Form4.resx
..........\..........\ImageShear.csproj
..........\..........\obj
..........\..........\...\x86
..........\..........\...\...\Debug
..........\..........\...\...\.....\DesignTimeResolveAssemblyReferences.cache
..........\..........\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..........\..........\...\...\.....\GenerateResource.read.1.tlog
..........\..........\...\...\.....\GenerateResource.write.1.tlog
..........\..........\...\...\.....\ImageShear.csproj.FileListAbsolute.txt
..........\..........\...\...\.....\ImageShear.exe
..........\..........\...\...\.....\ImageShear.Form1.resources
..........\..........\...\...\.....\ImageShear.Form2.resources
..........\..........\...\...\.....\ImageShear.Form3.resources
..........\..........\...\...\.....\ImageShear.Form4.resources
..........\..........\...\...\.....\ImageShear.frmScreen.resources
..........\..........\...\...\.....\ImageShear.pdb
..........\..........\...\...\.....\ImageShear.Properties.Resources.resources
..........\..........\...\...\.....\ResolveAssemblyReference.cache
..........\..........\...\...\.....\TempPE
..........\..........\Program.cs
..........\..........\Properties
..........\..........\..........\AssemblyInfo.cs
..........\..........\..........\Resources.Designer.cs
..........\..........\..........\Resources.resx
..........\..........\..........\Settings.Designer.cs
..........\..........\..........\Settings.settings
..........\obj
..........\...\x86
..........\...\...\Debug

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