Reply To: exchange low res picture to high res when exporting

If you kept two folders, one called ‘Low’ with the low res pictures in, and one called ‘High’ with the hires, you could set your document up with all of the LR images. Then when the time came you could move the ‘Low’ folder somewhere else in your file structure. InDesign would lose the links and display a yellow alert triangle. Then you can pick the first image and relink it to the appropriate image in the ‘High’ folder. ID will then update all of the images with the hires equivalents. This will only work if they have the same name, however.

To be honest, since ID works on a linked basis and you have the option of viewing different resolutions when working on a file, I would just put the hires files in from the start, but this would work.