Re: Open every nth image in a stack?

Wayne,

Ok...so I ran ImageJ in the Debug mode and got:

    273, "StripOffsets", value=100600808, count=126

I used 126 in the macro using my image's height and width like this

run("Raw...", "width=1004 height=1002 offset=126 number=10 gap=0")

BUT the images were shifted to the right a bit.
So I tried to decrease the offset and that seemed to help, but on a  
whim I used your example offset of 768 and "wallah" it worked fine.

WHY?

Mike



On Nov 22, 2005, at 12:04 PM, Wayne Rasband wrote:

> > How do I find the offset in a tiff stack?
>
> It is the value of tag 273 (StripOffsets), which you find by  
> opening the stack in ImageJ with "Debug Mode" checked in  
> Edit>Options>Misc.
>
> -wayne
>
>
> > On Nov 22, 2005, at 10:44 AM, Wayne Rasband wrote:
> >
> > >>  I am generating very large stacks and it would often be useful
> > >>  when  importing a stack of images to only open a subset of
> > >>  the stack.  Such  as the first 100 slices or every third slice.
> > >>  Is there a way to do  this?
> > >
> > > You may be able to do this using the File>Import>Raw command if the
> > > images are uncompressed TIFFs, you know the offset to the first
> > > image, and the images are stored consecutively. For example, you
> > > can import the first 10 slices of a 100 slice stack of 512x512 16-
> > > bit images using the macro
> > >
> > >   run("Raw...", "width=512 height=512 offset=768 number=10 gap=0")
> > >
> > > You can import every third slice using the macro
> > >
> > >   run("Raw...", "width=512 height=512 offset=768 number=33
> > > gap=1048576")
> > >
> > > These macros assumes the TIFF stack was created by ImageJ, where
> > > the offset to the start of the image data is always 768. To import
> > > every third slice the gap must be set to 512*512*2*2 (1048576).
> > >
> > > -wayne
> > >