Inkscape

Missing charset conversion of metadata when exporting to PNG

Bug #1199204 reported by Sebastián Puebla
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Inkscape
In Progress
Low
jazzynico
Inkscape 1.0

Bug Description

When Inkscape 0.48.4 exports a SVG file to PNG, it writes its metadata as 'tEXt' chunks containing UTF-8 strings instead of ISO 8859-1 text as defined by the PNG specification, section 11.3.4.3. This bug does affect to PNG files created via "Save as..." > "Cairo PNG file" since such files do not have any textual information.

Revision history for this message
Sebastián Puebla (spuebla) wrote :
Revision history for this message
Martin Owens (doctormo) wrote :

I'm wondering why we're using tEXt chunks instead of iTXt chunks which support compression and UTF-8

Reinvent specification page: http://www.w3.org/TR/PNG/#11tEXt

spuebla, would it be easy for you to make a patch supporting iTXt instead?

Changed in inkscape:
status: New → Confirmed
Revision history for this message
jazzynico (jazzynico) wrote :

Tested successfully on Windows XP, Inkscape trunk revision 12414 (Title field with ùö characters exported correctly).

Changed in inkscape:
assignee: nobody → Sebastián Puebla (spuebla)
importance: Undecided → Low
milestone: none → 0.49
status: Confirmed → In Progress
tags: added: bitmap
Revision history for this message
jazzynico (jazzynico) wrote :

On Crunchbang Waldorf (Debian stable), I see the exact opposite. The pngmeta command line tool gives a correct title without the patch, but a wrong encoding with the patch.
Could someone else confirm on a Gnu/Linux distro or OS-X?

Revision history for this message
su_v (suv-lp) wrote :

On 2013-09-05 21:15 (+0100), JazzyNico wrote:
> Could someone else confirm on a Gnu/Linux distro or OS-X?

Sorry, didn't get around to test this (on OS X) in time for 0.91 - moving milestone to 0.91.1 (AFAICT the available patch doesn't affect strings marked for translation).

Changed in inkscape:
milestone: 0.91 → 0.91.1
Revision history for this message
su_v (suv-lp) wrote :

On 2013-09-05 21:15 (+0200), JazzyNico wrote:
> On Crunchbang Waldorf (Debian stable), I see the exact opposite. The
> pngmeta command line tool gives a correct title without the patch,
> but a wrong encoding with the patch. Could someone else confirm on a
> Gnu/Linux distro or OS-X?

Same results on OS X 10.7.5 with Inkscape 0.91+devel r14389: correct title without the patch, wrong encoding when exported with patch from comment #1 applied.

PNG metadata of exported PNGs was verified with 'identify -verbose' from ImageMagick 6.9.2-0. Installed version of libpng: 1.6.18.

Revision history for this message
su_v (suv-lp) wrote :

Moving milestone to 0.92 - this needs further investigation (possibly only affects Windows builds?).

Changed in inkscape:
milestone: 0.91.1 → 0.92
Revision history for this message
jazzynico (jazzynico) wrote :

Assigning to myself to be sure not to forget to investigate the issue.

Changed in inkscape:
milestone: 0.92 → 0.93
assignee: Sebastián Puebla (spuebla) → jazzynico (jazzynico)
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