oooh that will be helpful, kindly point me to how i can begin with getting a sub-image that has the same width as the original. That will be my starting point. Regards
Johnson On Fri, Sep 4, 2009 at 3:56 PM, Kent Johnson <ken...@tds.net> wrote: > On Thu, Sep 3, 2009 at 6:01 PM, Jojo Mwebaze <jojo.mweb...@gmail.com> > wrote: > > thanks guys, > > Currently i am using pyfits, a bit slow cause loads the file in memory, > > creates a subimage and then saves the file then transmits > > the file over the network! My idea is, if there is a way of creating a > file > > pointer to the location on disk, where the subimage lies, reading a > specific > > size, and sending only the data read (like wayne had suggested) > > Do you think this possible? > > Not by just reading a single portion of the file; even for an > uncompressed bare raster image this would only work if the sub-image > is the same width as the original. For a FITS file you also need to > create a new header. > > It is technically possible to construct a subimage in memory without > reading the original into memory but you would have to understand the > details of the FITS format. > > You may be able to transmit the image without saving it first. Or > perhaps one of the other FITS libs is faster. > > Kent >
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