In a printing system, a developed photo filmstrip is put in a film scanner to pick up image data from all picture frames photographed on the filmstrip. An index image of the picture frames is displayed based on the image data, so a user selects picture frames to print with reference to the index image while designating a print size to each picture frame. The image data of each designated picture frame is compressed at a rate that is decided according to the print size. The higher compression rate is used for the smaller the print size. The compressed image data and print order data are transferred to a work station of a photofinisher. The photofinisher reproduces the original image data from the compressed image data, and makes prints based on the image data and print order data.