I've just finished uploading all submitted photographs to Costco's Print Center. You are having such fun with your iPhone and the apps we've used this semester.
There are several things we want to dig deeper into next semester. 1) Emailing photos has an option to send at full/medium/small size. Printing requires full size. 2) Uploading to Dropbox and share files. 3) Work with Shared Albums (only upload photos). 4) Set the canvas size for photographs or crop to a specific size. 5) Monitor resolution of your photos.
You will want to process your own photos for printing at home or at a service bureau like Costco.
Notes:
First batch - Email images saved to computer hard drive (Dropbox folder). Used web browser to login to Costco Photo Center and upload photos. One image is marked low resolution so all prints will be 5x7. Select photos and send to shopping cart. Confirm print size and cropping. Submit order.
Second batch - Email images saved to computer and uploaded again. Some photos do not fit 5x7 crop. Stop and re-think process. Open Photoshop on computer and open new document at 5x7 inches, 150 ppi, 16-bit. Use File > Place to add emailed photos as individual layers and fit to canvas size. Save individual layers as jpeg images at 12 max quality. Upload to Costco, select images for shopping cart. Confirm photo size and cropping. Submit for printing (next day delivery).
The Mpix app, downloaded the first week, helps visualize canvas size, cropping and resolution.
I'm sure you have questions and ideas we can explore next semester.