• <progress id="47fdn"><track id="47fdn"></track></progress>

    <rp id="47fdn"><object id="47fdn"><input id="47fdn"></input></object></rp>

    Wratten Gelatin Filter

    A thin, plastic color filter used in the photographic generation of color separations. A Wratten filter is optically pure, and the various colored filters are identified by number, the most often-used filters being #25 (red), #58 (green), and #47B (blue).

    All text and images are licensed under a Creative Commons License
    permitting sharing and adaptation with attribution. (See Copyrights for details.)

    PrintWiki – the Free Encyclopedia of Print
    About    Hosted by WhatTheyThink


    可打现金的麻将平台