Abstract: A method of reenlargement of microfilm originals stored in form of microimages includes providing a plurality of microimages on a carrier, selecting microimages from the plurality of microimages for reenlargement on a receiving medium, positioning a selected microimage in an image window suitable for the reenlargement, transferring the microimage on the receiving medium by an objective focused on the image window, during the transfer of the microimage on the carrier positioning a second microimage located on another carrier in a second image window and after the transfer of the first mentioned microimage, transferring the second microimage on the receiving medium.

Abstract: A process of forming on a copying material from an original having respective minimum and maximum density values D.sub.min and D.sub.max a copy having respective minimum and maximum density values P and Q, different from D.sub.min and D.sub.max, comprising the steps of: forming first and second non-superimposed test wedge images by exposing first and second specimens of the copying material to light of respective first and second colors, the exposure of the first and second specimens being such that the respective average exposure times are T.sub.B and T.sub.G, with the exposure to light varying across each specimen according to a preselected relationship, determining from the first test wedge image the density values D.sub.1 and D.sub.3 which an original must have to produce upon the copying material the respective density values P and Q if the copying of such original onto the copying material is performed with light of the first color for an exposure time T.sub.