Bad booklet export
I'm trying to export a file as a booklet in InDesign. All of the Pages export in the correct order for printing, but the images gain these little pixely artefacts where there previously were none. The Original image files were quite large, and sized down when placed on the InDesign file, and when I look at the file with High Quality preview it's relatively crisp (though still not as crisp as the original images when zoomed in). Even if I just try to export it at "press quality" without the booklet rearranging, it doesn't turn out as crisp as the original images. When I do it as a booklet, its even worse.
What exactly is going on here?
This comic is going to be comics printed on 8.5x11' paper. the original png images are 11x17 at 300 ppi and there are two on each page shrunk to about 8.5x5.5 each.
At this point I'm tempted to just arrange the whole thing manually in Photoshop but I really want InDesign to work.