JS9 Sync: synchronize operations between two or more images

You can use the View -> Sync Images plugin to synchronize two or more images, so that when an operation is performed on one image (e.g. change of colormap, contrast/bias, pan, regions, scale, wcs, zoom), it also is performed on the other image(s). First choose the images that should be kept in sync. The choose the operations that you want to sync. Click Sync Repeatedly to keep these images in sync. You can also sync once only by clicking Sync Once.

By default, synchronization is reciprocated: a change in any image causes the others to be synchronized. Synchronization can be configured one direction only by unchecking the reciprocate option. For advanced use, the JS9.SyncImages() and JS9.UnsyncImages() public API calls are available programmatically or from the command line.

Synchronizing images

This demo displays Chandra, Galex, Spitzer images of the colliding galaxies NGC 2207 and IC 2163, synchronized on regions and zoom operations. The region screen sizes differ because the image scales differ, but their wcs sizes are identical. Move a region around to see updated region stats for all three.

JS9 Demos:

web page configuration: multiple displays: plugins: colors: data analysis: FITS support: not often needed: