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Trace bitmap does not work (at all or leaves the image as bitmap)

Steps to reproduce:

Hi,

I've been given a pdf with a raster image, that I have to vectorize (see attached files)

The procedure I follow is the one provided in the following video: https://www.youtube.com/watch?v=kifHPAezh8A

  1. Using Inksapce version 0.92.4 from PortableApps in windows 7
  2. Import the image
  3. Resize document to image
  4. Select image
  5. Path > Trace bitmap

What happened?

  • A few minutes ago, I had a pop up, now I have absolutely nothing...

  • When I had the popup, I selected multipass > color > 20/30/40 and most of the time clicking OK did nothing, sometimes I obtained a rolling wheel, the a modified image (smoothed-low color nb) but the image was still a raster, not a vectorized one.

  • Behaviour is different if I import the pdf (never see the pop up) or the png ( sometimes see the popup, but does not work)

What should have happened?

  • I should always see a pop-up when I click "Path > Trace bitmap"
  • I should always obtain a rolling wheel (==running process) & modified image when I select Update/OK in the pop up
  • The resulting image should always be a vector image, not a raster one
  • Behaviour should be the same whatever the format of the imported image.

Inkscape Version and Operating System:

  • Inkscape Version: 0.92.4
  • Operating System: windows
  • Operating System version: 7

Example files:

The original image: pelo.pdf I've also extracted the raster image as a png: pelo

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