Throughout the nineteenth century, lithography was primarily a graphic art form and, as such, still holds a high artistic reputation. Lithographs are original artworks of artists and are typically signed, while offset lithographic printing and reproductions do not have a signature.
It is called offset because it does not directly transfer the ink to the paper. Because offset presses run so efficiently once set up, when larger quantities are required, offset printing is the best choice and provides accurate color reproduction and crisp , clean, professional-looking printing.
Lithography was primarily a graphic art form throughout the nineteenth century and, as such, still holds a high artistic reputation. Lithographs are artists' original artworks and are typically signed, while there is no signature for offset lithographic printing and reproductions.
Thanks to PNGs' high color depth, the format can handle high resolution photos easily. However, since it is a lossless web format, file sizes tend to become very large. PNG graphics are optimized for the screen. You could definitely print out a PNG, but you'd be better off with a JPEG (lossy) or a TIFF file.
FedEx-Kinkos is probably a pretty good bet if you don't have access to a local printer. Printing [black & white] on your own paper is also just about $0.10 per page! Some quantities of paper, including colored cardstock, are sold by most office supply stores (Office Depot, Staples).
Today, average inkjet printers generally have a 1200 x 1440 dpi resolution. If you're not going to print photos larger than 5 x 7 inches, this is a good enough resolution.
Search for an impression quality and good condition of the paper when identifying a valuable print. Look at the paper and see if a watermark or distinctive marking is present. The condition of the paper will also have an impact on value: tears, creases, stains.
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