Re: Open every nth image in a stack?

Posted by Wayne Rasband on Nov 22, 2005; 6:04pm
URL: http://imagej.273.s1.nabble.com/Open-every-nth-image-in-a-stack-tp3704402p3704407.html

> 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
> >