Maybe a function is needed here to just read the header information about nifti.jl HOT 3 OPEN

You can try with

header = niread(fn; mmap=true).header

This opens the data as a memory mapped file, only reading the array from disk, when you actually access it. You can also open larger files than your memory with that. But I'm not sure if it works with compressed files.

from nifti.jl.

Thanks for your reply, and I tried it.It does not work on gzip files.It throws an error at this line.

if mmap
    if header_gzipped
        close(header_io)
        close(file_io)
        error("cannot mmap a gzipped NIfTI file")

from nifti.jl.

We need to separate some of the processes here and have something like niload(f::AbstractString) -> IOMeta and read(::IOMeta) -> AbstractArray. It will take a little reworking because the whole I/O routine is pretty inflexible at the moment.

from nifti.jl.