[MINC-users] mincresample of negative zsteps

[Soren Christensen]

Thanks Andrew,
 I just bumped into another issue with mincresample this afternoon - this
time with ordinary positive zsteps:

Shouldn't the resampled file below get a zstep of 4?    what could be the
reason it becomes 3.74669 only?

mincinfo roi_no_header.mnc
file: roi_no_header.mnc
image: unsigned byte 0 to 255
image dimensions: zspace yspace xspace
    dimension name         length         step        start
    --------------         ------         ----        -----
    zspace                      9      unknown      unknown
    yspace                    512      unknown      unknown
    xspace                    512      unknown      unknown

mincinfo template.mnc
file: template.mnc
image: unsigned short 0 to 65535
image dimensions: zspace yspace xspace
    dimension name         length         step        start
    --------------         ------         ----        -----
    zspace                      9            4     -513.102
    yspace                    512     -0.40625       102.84
    xspace                    512     -0.40625      103.797


mincresample -like template.mnc -nearest roi_no_header.mnc
roi_l_template.mnc

file: roi_l_template.mnc
image: unsigned byte 0 to 255
image dimensions: zspace yspace xspace
    dimension name         length         step        start
    --------------         ------         ----        -----
    zspace                      9      3.74669     -513.102
    yspace                    512     -0.40625       102.84
    xspace                    512     -0.40625      103.797



Cheers
Soren


On Tue, Nov 2, 2010 at 3:23 PM, Andrew Janke <a.janke at gmail.com> wrote:

> I think so ( in this case). Peter oroginally made a distinction
> between the slice and in-plane dimensions for reasons known to him. I
> think a lot of the reason was around slice scaling of image ranges.
>
> In any case it can sometimes make for some interesting (and at times)
> unexpected results. :(
>
>
> a
>
> On Tue, Nov 2, 2010 at 14:48, Soren Christensen <sorench at gmail.com> wrote:
> > I am not sure where the problem arises (is it that zspace is my slowest
> > varying dim and the -1 you allude to?)
> >
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