Your photo book designer is getting better all the time, and I understand that in lieu of PDF import at the time, you accept rasterized images of full-page spreads. I have some questions:
1) What is the NATIVE resolution of your printing process? What are the EXACT pixel dimensions of the full-page spreads (with bleed) for 12x12 boooks (and perhaps other sizes), that when placed on a full-page spread, will result in NO re-scaling in your software /hardware as it exposes the photo paper?
2) Will fine text provided at the above native resolution look as sharp as the text from your photo book designer? If not, why? What text rasterizing setting from Photoshop do you recommend? (fine, smooth, sharp, etc).