Re: [Gimp-user] (Mis?)use of jigsaw filter

[Richard <strata_ranger hotmail com>]

> Date: Sun, 28 Feb 2016 07:24:04 -0500
> From: ad707 ncf ca
> To: gimp-user-list gnome org
> Subject: [Gimp-user] (Mis?)use of jigsaw filter
>
> I love the output of the jigsaw filter and would like to use it to laser 
> cut some jigsaw puzzles.
>
> However I have been unable to produce the obligatory single 0.001" line 
> that the laser cutter requires.
>
> Customarily I would use Inkscape to produce the final cutting template 
> but Inkscape treats the GIMP produced image as two lines with fill 
> between them.  Removing the fill is simple but, of course, leaves the 
> double lines.
>
> Does anyone have a solution in GIMP - or indeed in Inkscape - for this?
>
> Much appreciate any assistance.
>
> TIA

This is not really something you can do in Inkscape because its bitmap trace necessarily traces both sides of 
each line.  However extracting the jigsaw pattern itself (albeit in bitmap form) is a simple operation in 
GIMP:

1 - Create a new layer, white, on top of the image.
2 - Execute a Jigsaw operation on that layer with a Highlight setting of zero. (a Bevel setting of 0px also 
works.)
3 - Go to the Layers > Transparency menu and perform a Color To Alpha using white as transparency.

If you absolutely need the cutting lines in vector form, what would be ideal here is for the Jigsaw filter to 
be able to output it as a GIMP path object instead of painting it onto the target layer but the plug-in 
doesn't do that in its current form.


-- Stratadrake
strata_ranger hotmail com
--------------------
Numbers may not lie, but neither do they tell the whole truth.