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Is there any tool to convert a colour picture to a black and white picture with just contours?

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  • You can do it in an image editor like GIMP, if GIMP is OK with you.
    – karel
    Apr 18, 2019 at 7:25
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    what do you mean by just contours? Do you have an example?
    – pLumo
    Apr 18, 2019 at 7:52
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    Like the borders between two colours. Like in ”colouring books”. At some level I guess you must treat different RGB values as the same colour to avoid having too many black lines
    – FORTRAN
    Apr 18, 2019 at 8:07
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    cell-shading it is called ;) Example tutorial: deviantart.com/wastelander7/art/… It is a manual task though afair
    – Rinzwind
    Apr 18, 2019 at 8:36
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    GIMP has Edge-Detect Filters in the Filter menu. Depending on the image, you may want to do a combination of color processing and kernel convolution. Alternatively, you could use the "fuzzy select tool" or the "scissors select tool", both of which will create a selection based on edge detection, which you can then transform to a path and stroke it. Or manually create a path in the first place. Or you can try Colors>Threshold.... But that really depends on the image. AFAIK there is no one-click-solution for every possible image.
    – danzel
    Apr 18, 2019 at 12:15

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