I have been tasked with creating a weekly color magazine thet is printed on newsprint on a web press. Can anyone give me a good rule of thumb for brightening the photos properly? example: decent looking photos, up brightness by 20, darker photos 30+, or should it be more? There are 100's of photos in each weekly issue (used car sales) so I would like to be able to batch process as many as possible. Most of the photos are 3"x2" or smaller Any help is appreciated. Thank you!