LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
April 2008
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2008.04.16 16:52 "Re: efficient thumbnailing", by Kai-uwe Behrmann
I have a C++ library for speedy colour correct thumbnailing here. Nethertheless, I understood the gtkpixbuf library was fixed recently, as stated in a comment to the bug tracker. kind regards Kai-Uwe Behrmann -- developing for colour management www.behrmann.name + www.oyranos.org Am 16.04.08, 09:26 -0400 schrieb Dr. Michael J. Chudobiak: > Hi all, > > Is there an efficient way to generate thumbnails from tiff files? > > Currently, when the gnome/gtk+ gdk-pixbuf tiff loader wants to generate a > thumbnail of a tiff file, it loads the entire image, and then scales it. (See > http://svn.gnome.org/viewvc/gtk%2B/trunk/gdk-pixbuf/io-tiff.c?view=markup). > > This uses a lot of memory, and the gtk+ scale-down routines are not very good > (http://bugzilla.gnome.org/show_bug.cgi?id=80925). > > Is there a way in libtiff to do some scale-while-loading, or prescaling, to > reduce memory usage and speed things up? (Or could it be added to libtiff?) > > The jpeg loader uses some fast-scaling trickery to scale down by a factor of > 2, 4, or 8 first (http://sylvana.net/jpegcrop/djpeg) - I was wondering if > there is a tiff equivalent. > > Suggestions and pointers to existing code appreciated! > > - Mike