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  2. Real photo postcard - Wikipedia

    en.wikipedia.org/wiki/Real_photo_postcard

    A typical 1940s–early 1950s black and white real photo postcard. A real photo postcard ( RPPC) is a continuous-tone photographic image printed on postcard stock. The term recognizes a distinction between the real photo process and the lithographic or offset printing processes employed in the manufacture of most postcard images.

  3. Cabinet card - Wikipedia

    en.wikipedia.org/wiki/Cabinet_card

    A true black-and-white image on a cabinet card is likely to have been produced in the 1890s or after 1900. The last cabinet cards were produced in the 1920s, even as late as 1924. Owing to the larger image size, the cabinet card steadily increased in popularity during the second half of the 1860s and into the 1870s, replacing the carte de ...

  4. Middle gray - Wikipedia

    en.wikipedia.org/wiki/Middle_gray

    Middle gray. 50% CIELAB lightness. ( Y = 18.4%) In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale; [1] in photography and printing, it is typically defined as 18% reflectance in visible light. [2] [3]

  5. 20+ Free Printable Valentine’s Cards for Your ... - AOL

    www.aol.com/20-free-printable-valentine-cards...

    If your kiddo’s school is requesting non-food treats on Valentine’s Day, check out these free printable dinosaur cards from Pineapple Paper Co.The free download prints six cards to a page, and ...

  6. History of photography - Wikipedia

    en.wikipedia.org/wiki/History_of_photography

    Included were methods for viewing a set of three color-filtered black-and-white photographs in color without having to project them, and for using them to make full-color prints on paper. [ 62 ] The first widely used method of color photography was the Autochrome plate, a process inventors and brothers Auguste and Louis Lumière began working ...

  7. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.

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