Bug 191288

Summary:	CRC error in chunk zTXt
Product:	[Applications] digikam	Reporter:	nqwvwpbw
Component:	Metadata-Engine	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	ahuggel, caulier.gilles
Priority:	NOR
Version:	0.10.0
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:	1.0.0

Description nqwvwpbw 2009-05-01 20:57:57 UTC

Version:           0.10.0 (using KDE 4.2.2)
Compiler:          gcc 4.3.3 
OS:                Linux
Installed from:    Ubuntu Packages

If I load a RAW (with metadata) in digikam, save it as a PNG and test it with pngcheck (2.0.0), this is what I get: "CRC error in chunk zTXt (actual d550028e, should be f690a1e1)".

Note that:
* this occours always (with digikam-converted PNGs)
* I don't know if it's the same with other image formats
* digikam reads its PNG's metadata just right

Comment 1 caulier.gilles 2009-05-01 23:31:49 UTC

Use last Exiv2 0.18.1 with digiKam/libkexiv2 and try again...

Gilles Caulier

Comment 2 nqwvwpbw 2009-05-02 15:29:53 UTC

I've tried but nothing changes.

Comment 3 caulier.gilles 2009-05-02 16:10:44 UTC

CRC is computed and set by Exiv2 library, not digiKam directy. Can you reproduce it when you change something in PNG using Exiv2 command line tool ?

Gilles Caulier

Comment 4 nqwvwpbw 2009-05-02 17:07:46 UTC

Yes, I was able to reproduce it (I've used this command: exiv2 -M"set Exif.Photo.UserComment charset=Ascii New Exif comment" no_metadata.png).

Comment 5 caulier.gilles 2009-05-02 17:10:53 UTC

Well, it's a bug in Exi2 PNG image parser...

Gilles

Comment 6 nqwvwpbw 2009-05-02 17:15:01 UTC

Thank you for your help.

Comment 7 Andreas Huggel 2009-05-03 02:05:08 UTC

Can you please attach the image no_metadata.png here, or better, open an issue for Exiv2 with the same instructions and image to reproduce the problem at http://dev.exiv2.org/projects/exiv2/issues

Thanks,
Andreas

Comment 8 nqwvwpbw 2009-05-03 10:39:11 UTC

I've opened an issue for exiv2 with the two images.
I think that this bug can now be closed.

Comment 9 caulier.gilles 2009-06-12 14:10:54 UTC

Exiv2 file open here : http://dev.exiv2.org/issues/show/630

Gilles Caulier

Comment 10 caulier.gilles 2009-06-14 18:07:35 UTC

See my comment in : http://dev.exiv2.org/issues/show/638

Exiv2 r1818 fix the problem.

Gilles Caulier