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I scanned a few comics, and have images like this

enter image description here

I would like to have the background white ... in fact, I would like to have the white transparent, but that's just "nice to have", not "must have".

The problem is that there is some use of greyscale, such as

enter image description here

at least, I think that his "beard" is ggreyscale rather than just black

Which gratis software can make this presentable? If it helps, I am thinking of printing T-shirts.

Preferably Windows, but any o/s is acceptable

  • Many (perhaps most) scanning programs will do this for you. Certainly the HP scanning software on my Mac does. The trick is to scan as black and white, not gray scale and set an appropriate threshold. Certainly GIMP will do it. – Eric S Nov 23 '19 at 14:41
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    Be advised that there are probably copyright issues if you want to see T-shirts. – Eric S Nov 23 '19 at 14:44
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Inkscape will do what you require. Inkscape is a free, multi-platform program which has a "trace bitmap" feature in the Path menu.

Traced image

Some details were lost as I did not adjust any of the default parameters. The process took about ten to fifteen seconds to accomplish.

The result will be an SVG (vector) image, but you can export the image to PNG via the file menu.

| improve this answer | |
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    This is a good answer since the vector image will be scalable whereas a black and white bitmap won't be. – Eric S Nov 23 '19 at 14:43

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