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How to read pixel value from a file and display in WPF?

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I have a file with pixel values like that:
78 234 56 37
62 162 63 78
28 129 30 37
12 231 12 127
24 121 95 194
which indicate that a 4*5 monochrome pixels map. I've got to read it from a file and store the pixel values in a list.
Now my question is, what shall I do to display it?
Since some of the file is rather large(more than 50M),  processing speed must also be considered. Is there a decent way doing this kind of work under WPF?

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