Learn how to save a Windows region to a file with GetRegionData and how to load and re-create it with ExtCreateRegion the Win32 API way.
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Learn how .NET enables you to easily allow your users to create a cropping area of an image with the mouse and then create a new image consisting of only that cropped area.
Creating a 24-Bit Per Pixel Subregion of a 24-Bit Per Pixel Bitmap
A tool to convert bitmaps to region files
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