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Converting a binary image view to the original image C#

Your blog has instructions for binarizing an image with a fixed threshold in C#. How to do the reverse operation? I need to convert the resulting binary view back to the original image using this API for C#. I didn’t find an explanation of how to do it.
Instruction is here: https://blog.aspose.com/imaging/convert-images-to-grayscale-in-csharp/

Hello, @JuliJ
You can make an image grayscale, but grayscale image can not be turned to colorful that simple.
When you do
using var image = Image.Load(path/stream)
, the input path/stream remains unchanged, so you are up to use it again to load the original image.
If you get a grayscale image as input, there is no built-in functionality for turning it to colorful.