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how to convert colored lines in a graph to black and white solid and dashed?

how to convert colored lines in a graph to black and white solid and dashed?

how to convert colored lines in a graph to black and white solid and dashed?

(OP)
Does anybody know of a way to convert an image of a graph with 3 colored lines (red, green and blue on a white background with black X and Y axes) into a black and white graph with solid, dashed and dotted lines? I only have a png image of these graphs as I lost the raw data in a recent hard disk crash. The image does not have separate layers. This is to publish the paper in an academic journal which does not do color.

I am using Windows but I can also get access to Ubuntu (i.e. if what I want can be done in Gimp - however I am not familiar with Gimp, so please spell out the required steps if this can be done in Gimp).

Alternatively, does anybody know of a programme which could convert my red, green and blue curves into 3 series of data points? I could then draw the black and white patterned lines I want.

Thanks

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