Add slice does not work for Virtual Stack?

[Wolfgang Gross]

Hi,

subject header says it all.

Tested with ImageJ 1.51d on W7(64) with Java 1.8.101 (32 and 64).
Also tested on Mac Yosemite, ImageJ 1.51d.

I opened an AVI (20 images) as virtual stack. Image/Stacks/Add slice did not
work. It works if I open the file as stack.

Is this an intended feature? User guide gives no hint.

Regards

Wolfgang Gross

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ImageJ mailing list: http://imagej.nih.gov/ij/list.html

[Michael Schmid]

Hi Wolfgang,

'Virtual Stack' means that the data are not in memory but each slice
(frame) is read from a file (the AVI file in your case) if it is needed.
  The file is read-only, so you cannot modify any data or add a slice.

   https://imagej.nih.gov/ij/docs/guide/146-8.html#sub:Virtual-Stacks

You can delete slices from virtual stacks, however  (ImageJ has a table
where the slices of a virtual stack can be found in a file; deleting a
slice simply deletes the corresponding entry in that table).

Michael
________________________________________________________________

On 2016-07-28 16:23, Wolfgang Gross wrote:
 > Hi,
 >
 > subject header says it all.
 >
 > Tested with ImageJ 1.51d on W7(64) with Java 1.8.101 (32 and 64).
 > Also tested on Mac Yosemite, ImageJ 1.51d.
 >
 > I opened an AVI (20 images) as virtual stack. Image/Stacks/Add slice
did not
 > work. It works if I open the file as stack.
 >
 > Is this an intended feature? User guide gives no hint.
 >
 > Regards
 >
 > Wolfgang Gross

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ImageJ mailing list: http://imagej.nih.gov/ij/list.html