You didn't say how you created the rectangles. I'm guessing that you made a selection and then stroked the selection.
Stroking a selection and stroking a path use different algorithms. The path one would work better in this case.
Do Selection > To Path
In the Paths tab make the path visible and active.
Then Edit > Stroke Path
Having said all this:
Gimp is a bitmap (raster) editor. I don't know what your cards will look like. But maybe a vector editor (Inkscape) would be better.
Okay, I followed your tipps, and the path looks great but if I stroke it, it again becomes pixelated even if I use only 1pixel as width. How can I simply use the path itself?
Unless you intend to create the whole design in (say) Inkscape, there is not much to be gained. Once imported into Gimp the svg is rasterised. However the corners are anti-aliased so should print ok
The corners of your borders do not look correct, the border is not constant width/parallel edges.
You can still use paths and an old script shape-paths might make it a little easier http://registry.gimp.org/node/59 use the 091 version.
A bit of calculation required for rectangle sizes, this an overlay with the paths stroked 20 pix.
If you are going to send the design off to a commercial printer for printing, do ask for recommended formats.
08-19-2017, 04:34 PM (This post was last modified: 08-19-2017, 04:37 PM by rich2005.
Edit Reason: edit
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Some where in your editing you lost anti-aliasing on those borders. Did you stroke the selection / path using the pencil tool as the option? Just use the regular stroke-selection(path) option. That is my stroked path next to yours.
That image size & ppi changed somewhere along the line.
Gimp can export as a PDF but there is no point, the image is rasterized including all that text.
For that particular image Inkscape and svg format would be best (not PDF, I think Inkscape rasterizes as well)
As an Inkscape SVG, create the text then convert it to paths and it will remain crisp on printing.
Ask the printer about cropping / bleed margins you will probably need to add 3 mm to all sides.
edit: If you do want to use a PDF format, the application to use is Scribus
08-19-2017, 04:36 PM (This post was last modified: 08-19-2017, 04:36 PM by Ofnuts.)
(08-19-2017, 03:24 PM)rich2005 Wrote: You can still use paths and an old script shape-paths might make it a little easier http://registry.gimp.org/node/59 use the 091 version.
08-19-2017, 07:00 PM (This post was last modified: 08-19-2017, 07:09 PM by rich2005.)
@BenjaminGer
I had a quick re-construct using Inkscape and a PDF might well be the way to go. It says it embeds the fonts and my PDF viewer says they are there. So they must be.
Inkscape has as much (or more) a learning curve as Gimp but there is plenty of help if you search. I think it is probably the better tool for the job.
note: the svg is grouped in order to export as a PDF, if you want to see how it is built up you need to ungroup.
edit: I see my ocr translated the umlaut to an accent - sorry about that
It is more complicated with this program. If I clicked on ungroup nothing changed with your image.