Pacino a écrit : > Hi, everyone, > > I am wondering whether it's possible to read part (e.g. 1000*1000) of > a huge jpeg file (e.g. 30000*30000) and save it to another jpeg file > by pure python. I failed to read the whole file and split it, because > it would cost 2GB memory. > > Can anyone help me? Any comments would be appreciated. > > Thanks. > > Robert >
Just reading parts of the *file* is easy (see tell() seek() and read() methods on files). But to extract a part of the *picture*, you must uncompress the picture in memory, grab the sub-picture, and save it back - generally with compression. I can't see how you can bypass the uncompress/compress phases and the corresponding memory use. A+ Laurent. -- http://mail.python.org/mailman/listinfo/python-list
