Method of screening half-tone picture themes
    1.
    发明授权
    Method of screening half-tone picture themes 失效
    筛选半色调图片主题的方法

    公开(公告)号:US4659113A

    公开(公告)日:1987-04-21

    申请号:US760348

    申请日:1985-07-29

    摘要: A method of screening half-tone picture themes, in which the gray tones of the half-tone picture theme are reproduced by changes in the structural width of a basic screen structure having any desired form. The assignment of a gray tone area of the half-tone picture theme to the screen structure width reproducing this gray tone area may be selectively determined. In a photographic version of the inventive method (FIG. 1), a basic screen structure 1 of any form is prepared and used to produce broadening screen structures as negative films 9,11. The same number of tone separations 20,22 is produced as negative films from the picture theme 13 to be screened, each of which tone separations reproduces a certain gray tone area of the half-tone picture theme which can be adjusted by the exposure time. Tone separations 22,20 are consecutively exposed onto a line material 24 with the broadening screen structures 9,11 respectively assigned to them, the line material then reproducing the screened picture theme in such a way that the gray tone parts determined by the tone separation are reproduced locally by the screen structure width assigned to it. There are several photographic and EDP/scanner/laser variants of this method suitable for screening half-tone picture themes, producing screened printing originals and printing data carriers with this kind of screened picture theme.

    摘要翻译: PCT No.PCT / DE82 / 00158 Sec。 371日期1983年3月30日 102(e)1983年3月30日PCT PCT。1982年7月29日PCT公布。 出版物WO83 / 00570 日期:1983年2月17日。一种筛选半色调图片主题的方法,其中通过改变具有任何所需形式的基本屏幕结构的结构宽度来再现半色调图片主题的灰色调。 可以选择性地确定将半色调图片主题的灰色调区域分配给再现该灰色调区域的屏幕结构宽度。 在本发明方法(图1)的照相版本中,制备任何形式的基本屏幕结构1,并用于产生作为负片9,11的增宽屏幕结构。 产生相同数目的色调20,22作为要被屏蔽的图片主题13的负片,其中每个色调再现可以通过曝光时间调节的半色调图片主题的特定灰色区域。 色调分离22,20连续地暴露在线条材料24上,其中扩展的屏幕结构9,11分别被分配给它们,线材然后再现被筛选的图片主题,使得由色调分离确定的灰色部分是 通过分配给它的屏幕结构宽度本地再现。 这种方法有几种摄影和EDP /扫描仪/激光变体,适用于筛选半色调图片主题,使用这种屏幕截图主题生成屏幕打印原件和打印数据载体。