TraceFromPixel but for images?

Hmm... I would also like to know a neat trick to do this. Are your images displayed on separate axes and not overlapping on the same axis (do you have an example file)? I think you could build a workaround by calling AxisValFromPixel() for each axis in the graph  and then checking whether the output is within one of the axes' range via GetAxis. If you have found the axis pair which are both corresponding to the correct horizontal and vertical directions you can identify the image (this requires that each image is plotted against an unique set of axes and you already know which axes correspond to which image, of course).

Thanks for the idea. The images I have may share one of their axis. I think AxisValFromPixel can still work for my use case using the other axes only.

Is each image inside its own subwindow? If you have a list of the names of the subwindows that contain the images, you can call GetMarquee on each one using the /W flag. The one with the marquee will return V_Flag == 1.

- get list of images

- for each image

  - get axes

  - if marquee coordinates fall within range of both axes

    - add image to list of hits

Ben Murphy-Baum wrote:

Is each image inside its own subwindow? If you have a list of the names of the subwindows that contain the images, you can call GetMarquee on each one using the /W flag. The one with the marquee will return V_Flag == 1.

They are not in separate subwindow. I was able to write the function using chozo's suggestion. But I like this idea as well and can use it in a different function where I am already using subwindow. Thanks