Isolating colours in scanned or shot images

Discussion in 'Photography' started by PLINY, Oct 23, 2006.

  1. PLINY

    PLINY Guest

    I have scanned an image of a map of spain with coloured contour lines.
    I want to isolate the contour lines which means either wiping the other
    colours or, forming layers. The colour of the lines is not a simple
    primary and on close examination of the pixels it shows quite a
    variation towards the edges. Does anyone know of a technique for doing
    this (preferably using free software). I assume that this type of fine
    colour separation would have a lot of other "art" uses. Do we have any
    software tyros?
    PLINY, Oct 23, 2006
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  2. PLINY

    Dave W Guest

    I have tried many times to do this with PaintShopPro on a scanned
    Ordnance Survey map, without success. As you say, the distinction
    between the contour colour and everything else is sometimes non
    existent. I think Photoshop has a facility for altering the Hue within
    narrow spectral bands, which might help, but I doubt it. If I can't
    separate them manually, I doubt whether a special program would be any
    Dave W, Oct 24, 2006
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