Mail Archives: geda-user/2023/10/01/21:24:05
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| 11-20020a056e0220cb00b0034936e110fbmr12995607ilq.18.1696209765560; Sun, 01
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| Oct 2023 18:22:45 -0700 (PDT)
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| From: | "Erich Heinzle (a1039181 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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| Date: | Mon, 2 Oct 2023 11:52:34 +1030
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| Message-ID: | <CAHUm0tP6Gwky0CyAFn90Cb-1uc49vy=V0dvwTZcATJFDHrfotQ@mail.gmail.com>
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| Subject: | Re: [geda-user] PCB silk layer image script
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| To: | geda-user <geda-user AT delorie DOT com>
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| Reply-To: | geda-user AT delorie DOT com
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--0000000000008a76d10606b19c76
Content-Type: text/plain; charset="UTF-8"
I have three approaches to pcb artwork
The simplest is image2footprint, which works well for bitmap graphics
https://github.com/erichVK5/image2footprint
The catch is, gEDA PCB does not have a distinct soldermask layer that is
editable, limiting the full range of effects possible.
There are better alternatives for pcb-rnd, including the parametric
bitmap() footprint which can be launched from the footprint library window
http://repo.hu/cgi-bin/pool.cgi?project=pcb-rnd&cmd=show&node=bitmap
and for more advanced effects, there is the parametric image2footprint
version for pcb-rnd which does Floyd Steinberg dithering or closest match
to menu selectable silk screen, copper (ENIG vs Pb/Sn) and solder mask
colours
http://repo.hu/projects/edakrill/user/erichvk/footprint/image2footprint.krill.tar.gz
Finally, for vector artwork, there is the inkscape2pcb extension for
Inkscape which can save in gEDA PCB and pcb-rnd file formats. Although
pcb-rnd has native support for gEDA PCB footprints, the inkscape exporter
takes advantage of the polygon in footprint support of pcb-rnd to export
any non self intersecting paths as polygons on a distinct layer as well.
pcb-rnd also allows scaling of any footprint in the buffer.
https://inkscape.org/~erichVK5/%E2%98%85inkscape2pcb
Regards,
Erich
On Sun, 1 Oct 2023 23:50 Richard Rasker (rasker AT linetec DOT nl) [via
geda-user AT delorie DOT com], <geda-user AT delorie DOT com> wrote:
> Hi all,
>
> Every now and then, questions pop up about converting a logo or other
> image into a silk screen element, and many answers involve a more or less
> manual process using Inkscape combined with pstoedit. Also see the thread
> 'PCB jpg to silkscreen' here, starting 7 November 2019.
>
> As I found I had to look up the details again every time, I decided to
> create a script by the name of pcbsilk that automates most of the process
> -- see attached file. It requires imagemagick, potrace and pstoedit to
> work, and accepts several common image formats (JPG, PNM as well as EPS).
>
> How it works:
>
> It first checks whether a width is specified for the resulting silk layer
> element. If no width is specified, it defaults to 40 mm.
>
> Then it checks if the input file is an EPS file already; if not, it uses
> imagemagick's convert to convert the image to PBM format, which is then fed
> to potrace to create an EPS file. The resulting EPS file is then converted
> into a PCB silkscreen element using pstoedit.
>
> But even though it works sort of OK, there are a few annoying things that
> I haven't been able to fix (apart from several smaller refinements):
>
> - When specifying width in millimeters, things work up to 73 millimeters
> but throw a sort of overflow error above that value:
>
> $ pcbsilk -W 74mm testlogo.jpg
> double free or corruption (!prev)
> /home/richard/scripts/pcbsilk: line 36: 15520 Aborted (memory
> dumped) pstoedit -q -f "pcbfill" -ssp $silkname.eps $silkname.pcb
>
> The actual size itself does not seem to cause the problem, as inch sizes
> (e.g. -W 74in) work just fine. So it seems that it is the millimeter units
> that somehow have a limited range -- not in potrace (where the width is
> specified), but in pstoedit. I could of course work around the problem by
> converting millimeter sizes into inches before calling pstoedit, so I think
> that's what I'll do.
>
> - Specifying a width of course also does not work for EPS files, as any
> scaling is done before conversion to EPS. Is there a way to specify width
> in pstoedit? Or is there an easy tool to scale an EPS element without
> having to parse the file myself?
>
> - The pstoedit command produces a PCB file with default workspace
> dimensions (6000 x 5000 mil here), with the silk image at the bottom left.
> Is it possible to (temporarily) adjust this default to fit the image size?
>
> Thanks for comments, corrections and of course solutions!
>
> Best regards,
>
> Richard Rasker
>
--0000000000008a76d10606b19c76
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">I have three approaches to pcb artwork<div dir=3D"auto"><=
br></div><div dir=3D"auto">The simplest is image2footprint, which works wel=
l for bitmap graphics</div><div dir=3D"auto"><br></div><div dir=3D"auto"><a=
href=3D"https://github.com/erichVK5/image2footprint">https://github.com/er=
ichVK5/image2footprint</a><br></div><div dir=3D"auto"><br></div><div dir=3D=
"auto">The catch is, gEDA PCB does not have a distinct soldermask layer tha=
t is editable, limiting the full range of effects possible.</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">There are better alternatives for pcb=
-rnd, including the parametric bitmap() footprint which can be launched fro=
m the footprint library window</div><div dir=3D"auto"><br></div><div dir=3D=
"auto"><a href=3D"http://repo.hu/cgi-bin/pool.cgi?project=3Dpcb-rnd&cmd=
=3Dshow&node=3Dbitmap">http://repo.hu/cgi-bin/pool.cgi?project=3Dpcb-rn=
d&cmd=3Dshow&node=3Dbitmap</a><br></div><div dir=3D"auto"><br></div=
><div dir=3D"auto">and for more advanced effects, there is the parametric i=
mage2footprint version for pcb-rnd which does Floyd Steinberg dithering or =
closest match to menu selectable silk screen, copper (ENIG vs Pb/Sn) and so=
lder mask colours</div><div dir=3D"auto"><br></div><div dir=3D"auto"><a hre=
f=3D"http://repo.hu/projects/edakrill/user/erichvk/footprint/image2footprin=
t.krill.tar.gz">http://repo.hu/projects/edakrill/user/erichvk/footprint/ima=
ge2footprint.krill.tar.gz</a><br></div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Finally, for vector artwork, there is the inkscape2pcb extension =
for Inkscape which can save in gEDA PCB and pcb-rnd file formats. Although =
pcb-rnd has native support for gEDA PCB footprints, the inkscape exporter t=
akes advantage of the polygon in footprint support of pcb-rnd to export any=
non self intersecting paths as polygons on a distinct layer as well. pcb-r=
nd also allows scaling of any footprint in the buffer.</div><div dir=3D"aut=
o"><br></div><div dir=3D"auto"><a href=3D"https://inkscape.org/~erichVK5/%E=
2%98%85inkscape2pcb">https://inkscape.org/~erichVK5/%E2%98%85inkscape2pcb</=
a><br></div><div dir=3D"auto"><br></div><div dir=3D"auto">Regards,</div><di=
v dir=3D"auto"><br></div><div dir=3D"auto">Erich</div><div dir=3D"auto"><br=
></div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div></div><br><d=
iv class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, 1 Oc=
t 2023 23:50 Richard Rasker (<a href=3D"mailto:rasker AT linetec DOT nl">rasker AT li=
netec.nl</a>) [via <a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delor=
ie.com</a>], <<a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie=
.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"mar=
gin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
=20
=20
=20
<div>
<p>Hi all,</p>
<p>Every now and then, questions pop up about converting a logo or
other image into a silk screen element, and many answers involve a
more or less manual process using Inkscape combined with pstoedit.
Also see the thread 'PCB jpg to silkscreen' here, starting 7
November 2019.<br>
</p>
<p>As I found I had to look up the details again every time, I
decided to create a script by the name of pcbsilk that automates
most of the process -- see attached file. It requires imagemagick,
potrace and pstoedit to work, and accepts several common image
formats (JPG, PNM as well as EPS).<br>
</p>
<p>How it works:<br>
</p>
<p>It first checks whether a width is specified for the resulting
silk layer element. If no width is specified, it defaults to 40
mm.</p>
<p>Then it checks if the input file is an EPS file already; if not,
it uses imagemagick's convert to convert the image to PBM format,
which is then fed to potrace to create an EPS file. The resulting
EPS file is then converted into a PCB silkscreen element using
pstoedit.<br>
</p>
<p>But even though it works sort of OK, there are a few annoying
things that I haven't been able to fix (apart from several smalle=
r
refinements):</p>
<p>- When specifying width in millimeters,=C2=A0 things work up to 73
millimeters but throw a sort of overflow error above that value:</p>
<blockquote>
<p><span style=3D"font-family:monospace"><span style=3D"color:#000000=
;background-color:#ffffff">$ pcbsilk -W
74mm testlogo.jpg =C2=A0</span><br>
double free or corruption (!prev)
<br>
/home/richard/scripts/pcbsilk: line 36: 15520 Aborted
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 (memory dumped) pstoedit -q -f "pcbfill" -ssp
$silkname.eps $silkname.pcb<br>
</span></p>
</blockquote>
<p>The actual size itself does not seem to cause the problem, as
inch sizes (e.g. -W 74in) work just fine. So it seems that it is
the millimeter units that somehow have a limited range -- not in
potrace (where the width is specified), but in pstoedit. I could
of course work around the problem by converting millimeter sizes
into inches before calling pstoedit, so I think that's what I'=
;ll
do.<br>
</p>
<p>- Specifying a width of course also does not work for EPS files,
as any scaling is done before conversion to EPS. Is there a way to
specify width in pstoedit? Or is there an easy tool to scale an
EPS element without having to parse the file myself?</p>
<p>- The pstoedit command produces a PCB file with default workspace
dimensions (6000 x 5000 mil here), with the silk image at the
bottom left. Is it possible to (temporarily) adjust this default
to fit the image size?<br>
</p>
<p>Thanks for comments, corrections and of course solutions!</p>
<p>Best regards,</p>
<p>Richard Rasker<br>
</p>
</div>
</blockquote></div>
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