[Digikam-devel] [Bug 233094] libpgf relevant : thumbnails blurry (when scaling) on PowerPC platform (big-endian)

Raphael Schweizer rschweizer at schweizer-informatik.ch
Thu Apr 15 13:48:47 BST 2010


https://bugs.kde.org/show_bug.cgi?id=233094





--- Comment #23 from Raphael Schweizer <rschweizer schweizer-informatik ch>  2010-04-15 14:48:33 ---
Created an attachment (id=42801)
 --> (http://bugs.kde.org/attachment.cgi?id=42801)
Modified to write debug image files

Vlado,

though we did find some PPC / big endian issues we couldn't reproduce the
dramatic quality loss you demonstrated in comment #12

I would be pleased to investigate further. Do you mind compiling digiKam using
the attached pgfutils.cpp (and comparing it's results to the PGFconsole [SVN:
https://libpgf.svn.sourceforge.net/svnroot/libpgf]). pgfutils is modified to
write to "/tmp/":
a) writeQImage.bmp (the thumbnail image we encode)
b) writeStream.pgf (the encoded thumbnail)
c) readStream.pgf (the pgf read from the thmbnails db)
d) readQImage.bmp (the decoded bitmap, returned to digiKam)
I'm interested in all those files (+ a) encoded with the console and afterwards
decoded + the original image.)

In order to make this work you'll have to create an album with only the image
of interest, load this album (-> a,b) and resize the thumb (-> c,d)

I know this is a lot of work, please let me know if I can assist in any way.

Raphael

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