When I do 3dmerge the image of size 1gb file becomes 1.5gb (rs-fMRI). They are still float32. I am a bit confused, I appreciate if anyone have any ideas why this is happening.
Here is the line of code I am using.
$ 3dmerge -1blur_fwhm 4.0 -doall -prefix /path/out/fmri_fn_blur /path/to/fmri