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April 2008
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2008.04.16 13:26 "efficient thumbnailing", by 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