Hi there
Thanks for your question.Actually i've never save and load the spriteImage into an array.But i often save image or rasteredge.com/how-to/csharp-imaging/load-from-file using an image SDK.It's easy and effective.Maybe you can take a look.Hope to help you.
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For this question,i found there is an assistance which can load image from url and process image as you wish .You can have a look.http://www.rasteredge.com/how-to/csharp-imaging/load-from-file/