Hi, The trigger to recalculate images is any change to image size, scaling quality or image filters. If neither of these parameters change, the images should not be reprocessed or re-uploaded. Ensure you have "Save project on make album" checked under jAlbum Preferences. This avoids a classic behavior pattern that causes unwanted reprocessing, namely:
1) User sets up an album project using certain settings and saves the project
2) User makes additional images setting changes and makes the album
3) User closes the album project or jAlbum without saving the last changes made to the image settings
4) User opens album project later on and adds images and makes album. Now all images are reprocessed as the recently opened album project's image settings don't match the settings used when the album was last made.
This scenario is effectively avoided by checking "Save project on make album" under jAlbum Preferences.