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I assume you want something like the image with the blue background. Try this: Command+Click the RGB composite channel to load it as a selection, and invert the selection. With the inverted selection active, make a new layer, and Edit > Fill it with White, and de-select.
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Wow. In this particular case you are home dry, because the line drawing is a PNG with transparent background.
So simply open it in Photoshop
Add a layer beneath and fill with blue. I also added grain because your example appeared to have some noise.
Set the line drawing mode to Screen.
I have inverted the line drawing because I think it looks better, but it works both ways.
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Another option would be a Blend If and a Color Overlay.