noun
In printing, a technique of filling an area with a pattern, often a mesh or screen, to create a shaded effect.
この図では、網掛け部分が修正箇所を示しています。
In this diagram, the shaded areas indicate the parts to be corrected.
noun
halftone dot meshing; halftone screening
In computing and printing, the process of converting continuous-tone images into patterns of dots for reproduction.
網掛け処理を施すと、写真が印刷しやすくなります。
Applying halftone screening makes the photo easier to print.
Compound of 網 (ami, 'net') + 掛け (kake, 'hanging' or 'applying'), referring to applying a net-like pattern.