Unfortunately Irfanview does not let you enter print size and dpi under Image > Resize/Reample, so you need to calculate the appropriate pixel values yourself. Assuming you want to print 8 x 10 inch at 300 dpi, you would need to enlarge your images to 2400 x 3000 pixel.
The formulas are:
pixel height = print height in inch * dpi value
pixel width = print width in inch * dpi value
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