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2004.12.10 21:52 "Re: Q: writing tiled TIFFs", by Bob Friesenhahn
On Sat, 11 Dec 2004, Andrey Kiselev wrote: > > On Thu, Dec 09, 2004 at 06:09:41PM -0500, Chris Losinger wrote: > > > > the problem, it turns out, is that none of the applications i was > > trying to read the image with handle tiled TIFF correctly. Photoshop > > can, but not much else. > > libtiff itself can read tiled images. TIFFRGBA interface (coded in > tif_getimage.c file) shows how to work with tiles. Unfortunately it is > not a trivial code, it covers many variants of bit depths, planar > configurations, orientations etc. In despite of this it works correctly The main problem with depending on TIFFRGBA is that one reason for using tiled images is to handle large images. The TIFFRGBA interface requires an enormous amount of memory for large images. When GraphicsMagick was updated to support reading tiled TIFF on a per-tile level, the read times for a large (1GB) tiled TIFF file improved tremendously. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us http://www.simplesystems.org/users/bfriesen