centerline trace bugfix release

Fixed #28
Hints for #27 added.

That is how a leaf should vectorize!

centerline-trace with clipping and quality options

• New option: cliprect, hairline, at_filter_iterations, at_error_threshold added.
• Fixed stroke_width of scaled images.

red: default filter-terations=4, error-threshold=2.0
yellow: filter-terations=0, error-threshold=1.0

centerline trace with setup.exe for windows

For use with inkscape-0.92.3
You also need to install autotrace setup.exe from http://github.com/jnweiger/autotrace/releases
The python-pil module should already be shipped with inkscape, if not, try

"\Program Files\Inkscape\python" -m pip install pillow

centerline trace now works on MacOS

Version 0.8 supports the new MacOS package from https://github.com/jnweiger/autotrace/releases
and tested on High Sierra with good old dolly.png like this:

centerline-trace support for mac slightly improved

• we can ow find autotrace in some typical locations on osx. the big question remains, how to make an autotrace package for mac. binaries are there, just not properly packaged: https://github.com/jnweiger/autotrace/releases

• please help who-ever has a mac, and can whip together a trivial package.

Support transparency with either white or black background

Adding support for transparent images. This simply assumes that we operate on white background as suggested in #3 -- this is plausible, as inkscape starts out with a white background anyway.

As suggested in #9 we apply black background when the user enables the 'trace bright lines' checkbox.

Support transparency

Adding support for transparent images. This simply assumes that we operate on white background as suggested in #3 -- this is plausible, as inkscape starts out with a white background anyway.

Added support for embedded jpeg

This is a bugfix release for

• #8 Only PNG works for embedded image
• #4 Extension creates file in my extensions directory
• #1 Cannot get working with Inkscape 0.48 in Ubuntu 14.04

Thanks everybody for filing issues!

Remove option added. Dependencies fixed.

This update of centerline-trace has seen several improvements.

• New feature: remove option to replace the bitmap with a vector graphics in one click.
• Execution speed is controlled by
  • limiting the megapixels per image sent to autotrace.
  • a user changeable number of candidate runs with autotrace. Default was 15, now 1, and still works great!
• Quality is controlled by
  • a despecle median filter
  • an equal brightness preprocessor (only needed with badly lit noisy photos)