Saving an Image

If you have edited an image (as distinct from the contours associated with the image), you will want to save the edited image. Only the first image volume can be edited and saved. Images can only be saved in Analyze format.

To save the image:

  1. From the "File" menu, choose "Save First Volume As..."
  2. In the "Save" dialog, go to the directory where you want to save the data
  3. Enter the new file name in the "Name" field of the "Save" dialog
  4. Press the "Save" button in the "Save" dialog
  5. If you make further edits, you can now save quickly by choosing "Save First Volume" from the "File" menu

16 bit images that were not originally in Analyze format (i.e., MINC images or imported images) will be saved as unsigned integers. This is technically not a valid Analyze format, since unsigned short integers are not part of the Analyze specification. However, storage of the data in unsigned format maximizes use of the available dynamic range. The Analyze glmax field is set to 65535 to flag the fact that the images are unsigned. The Automated Image Registration (AIR) package recognizes the unsigned format. If you need to convert the data to signed integers, you can configure and compile the AIR package to generate signed output and then use an AIR program such as reorient to convert the output of MultiTracer to signed values.

16 bit Analyze images that are loaded as unsigned integers (based on the Analyze header glmax field) will be saved as unsigned integers. Likewise, 16 bit Analyze images that are loaded as signed integers will be saved as signed integers. However, negative signed integer values are reset to zero when the Analyze images are loaded, so no negative values will be saved.

Back to main MultiTracer page ©2001-2003 Roger P. Woods, M.D.

Modified: April 30, 2003