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For coordinating the auxilliary windows*1 of two or more similar*2 image windows. Links windows that are similar to the front window*3. (Make sure that one of the image windows you wish to link are in front.)
Affects operation of the auxilliary windows made by the Pixels... button. The pixel positions, values or statistics (of a little rectangle) from two or more images may be compared in this way.
The links are symmetric, or bi-directional. In other words, it does not matter if you make image A the top image, and then select image B to make the link, or the other way around. Or, for more than two images, it doesn't matter which of them is the top or front image when pushing the Links... button.
Different groups of images can be linked at the same time. This can get confusing.
Clicking on the links button presents a popup menu with these items:
Clear: Clears all links. This affects mouse clicks, but has no visibile effect on any window.
Pop: Pops all images linked to the front image.
List: Prints out a list of links in the Listener or Monitor window. Each window that has links is listed next to the window to which it is linked. Note that windows are listed twice, since this lister just goes through each image window window, printing the names of other windows in the link list. the Pop menu might be a clearer way to see what is linked to any particular window, but this is a way to check on whether or not any other links exist.
*1 (made with the Pixels... button or made by the blober). Button clicks in one image (window), as they update the data in the auxilliary windows for that image, will also update the auxilliary windows for any linked images (image windows).
*2 Linked images must have the same pixel dimensions (size). The zoomed size of the window does not matter.
*3 NOTE: The blow up window (an auxilliary window) is also an image window. This can cause confusion: if there are two images, and two blow up windows, and a blow up is in front, rather than one of the image windows, then the blow ups will be linked, rather than the image windows, which will not give the desired response. Make sure that the image window is in front.
The reason this can happen, is that blow up windows can in turn have blow up windows - so it is consievable that the blow up windows actually might need to be linked.