1996.11.14 19:05 "Single TIFF read/write", by Frank Kim
I was wondering if you know of a way to read and write to the same tiff file. I tried the "r+" mode but i had to close and open the file every time i change a scanline, besides it doesn't like compression (even when the rowsperstrip field is 1).
The reason being that i have a 1.6 Gbyte image and opening a new one is practically impossible.
All i wanna do is change some pixels inside the image.
According to the HTML documentation (tiff-v3.4/html/libtiff.html#FIO):
Note that unlike the stdio library TIFF image files may not be
opened for both reading and writing; there is no support for altering
the contents of a TIFF file.
I tried doing both a read and write in some programs. Sometimes it worked but other times I got seg faults. I'd have to say it sounds like a bad idea.
Frank Kim NetCentric Corporation
17 Monsignor O'Brien Highway, Cambridge, MA, 02141
frankkim@server.net (617)720-5200 x143
http://cag-www.lcs.mit.edu/~frankkim/