Trace bitmap preview broken

Bug #631444 reported by jazzynico
74
This bug affects 10 people
Affects Status Importance Assigned to Milestone
Inkscape
Fix Released
Medium
Unassigned

Bug Description

Report based on Question #124257 (Trace bitmap feature in version 0.48)
--
Hello,
   I recently downloaded a newer version of Inkscape. I had version 0.46 and upgraded to 0.48....It seems the trace bitmap brightness cuttoff feature doesn't work or doesn't work the same as the other version.....Is there a fix for this? When I click on it to preview the preview screen goes blank.....I tried adjusting the threshold but nothing worked....the edge dectection works....
Thanks,
  Larrie

Revision history for this message
jazzynico (jazzynico) wrote :

Confirmed on Windows XP, Inkscape 0.48 and trunk revision 9736.
The preview remains blank (or black if invert image is checked) when I click on the update button.

Works correctly with 0.47.

Changed in inkscape:
importance: Undecided → Medium
status: New → Confirmed
tags: added: tracing ui
tags: added: regression
Revision history for this message
jazzynico (jazzynico) wrote :

Note that the preview is updated when clicking on Ok.

Revision history for this message
Brynn (brynn4inks-deactivatedaccount) wrote :

I can confirm on Windows 7, 64-bit, and Inkscape 0.48 stable release.

su_v (suv-lp)
tags: added: win32
Revision history for this message
Robert Bigart (bobigart) wrote :

That is what happen to me.

Bob Bigart

Revision history for this message
jazzynico (jazzynico) wrote :

Some recent findings:

1. Open a new file an import (embed) a bitmap.
2. Open the Trace bitmap dialog and preview in brightness cuttoff mode -> the preview stays blank.
3. Save the file and close inkscape.
4. Open the saved file and try again step 2 -> the preview works as expected.
5. Import another bitmap and try again step 2 with the imported bitmap -> the preview stays blank.

The only difference between the two embedded bitmaps is the content of the xlink:href attribute: the imported image data contains 0A(hex) characters (line feed) which are replaced with 20(hex) characters (space) in the saved image.

Revision history for this message
Mark Crutch (markc-qsiuk) wrote :

I noticed what I think is the same issue in Inkscape 0.48 on Ubuntu 10.10.

I was trying to trace a black and white QR code, and the preview stayed blank until I'd set the threshold to 1.00, at which point it appeared as expected. Even then, trying to actually create a trace failed to produce a result on the canvas.

Revision history for this message
Hardi Cahyanta (cahyanta) wrote :

I confirmed that same issue, on Windows XP --- > trace bitmap preview is not working when using brightness cut off or brightness steps. I have tried to change the value on the variables and click "update", nothing showed.
Also I confirmed when click OK, on that method of tracing, the preview showed the picture.

I already sent a report, bugs no.
https://bugs.launchpad.net/bugs/905887.
Hence, hereby I confirmed that my report is a duplicate ofthis topic.

Revision history for this message
jazzynico (jazzynico) wrote :

Reproduced on Windows XP, Inkscape 0.48.2.
Not reproduced with trunk revision 10948 (devlibs r27) and 10568 (devlibs r25).
I don't know what fixed it, but now it works!

Changed in inkscape:
milestone: none → 0.49
status: Confirmed → Fix Committed
Changed in inkscape:
status: Fix Committed → Fix Released
su_v (suv-lp)
Changed in inkscape:
status: Fix Released → Fix Committed
Changed in inkscape:
status: Fix Committed → Fix Released
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