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April 2007
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2007.04.25 13:56 "Re: orientations 5-8 not handled correctly", by Frank Warmerdam
Dr. Michael J. Chudobiak wrote: > Hello all, > > libtiff correctly flips images with orientation tag values of 1-4, but > it does not handle orientations 5-8 correctly. 5-8 require rotations > rather than horiz/vert mirroring (see > http://sylvana.net/jpegcrop/exif_orientation.html). > > Specifically, libtiff/tif_getimage.c: setorientation has code like: > > switch (img->orientation) { > case ORIENTATION_TOPLEFT: > case ORIENTATION_LEFTTOP: > bla bla bla.... > > The code treats ORIENTATION_TOPLEFT the same as ORIENTATION_LEFTTOP, but > obviously they are not the same. > > Is this deliberate? > > This has come up in the gnome bugzilla, see > http://bugzilla.gnome.org/show_bug.cgi?id=428725#c52. > > We need to fix it either in the gnome tiff pixbuf loader, or in libtiff. > > Suggestions? Mike, Please file the details in the libtiff bugzilla, and we should be able to resolve this. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | President OSGeo, http://osgeo.org