While doing research for a project in some old Rod & Custom magazines I found some reference pictures for another Board Member's project that I copied off to mail to him. I just wasn't happy with the results, I copied them off on a pretty high dollar copier at work, still the details were washed out. I first thought that the pictures were printed in black and white, and monkeyed with the settings a little they still looked washed out.
Lightbulb moment, remembered something from High School Graphic Arts eons ago and tried the color setting on the copier. Viola! The picture came out nearly as good as the magazine.
The Tip is when copying pictures for research from old Hot Rods, Rod & Customs, Little Pages, etc. where the pictures are printed in the black, white and greenish blue. Copy in color and they will look very close to the magazine you copied them from.
The other tip here is that I almost always copy the picture from the magazine(s) and work off of the copy, it preserves the old magazines just a bit more. I've been doing this even for artwork for a long time, just rediscovered the first tip lately.