Bump exposure: Method of increasing highlight contrast when producing a half-tone by removing the screen briefly to remove any dots in the highlight area.
无网曝光：是增加半色调图片的光部对比的方法。摄制时把网片除下作短时间曝光使光部的网点消失。
2
Zinco a line or coarse screenhalf-tone block etched on zinc for letterpress printing. see zinc engraving.
线条锌版活版印刷用的线条或粗网半色调凸版。参阅锌电版。
3
Linen screen a special effect half-tonescreen giving a linen texture to the picture.