The pixel data of an image will not be read on demand. When you call the Ping method you explicitly tell Magick.NET to not load the pixel data. And when you call the Read method you will always load the pixel data. You should follow up a call to Ping with a call to Read when you determined that you need the pixel data. And there is no need to call Read multiple times for the same image. I hope this answers both your questions.
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