noun
solid black; 100% black; K100 black
In printing, refers to a solid area of pure black ink, as opposed to rich black or screened black. Often used in design and prepress contexts.
このロゴは墨ベタで印刷してください。
Please print this logo in solid black.
背景を墨ベタにすると、文字が白く抜けて見えます。
If you make the background solid black, the text will appear reversed out in white.
Halftone dots create shades of gray by varying dot size; 墨ベタ is a solid, unbroken black area.
墨 (sumi, 'black ink') + ベタ (beta, 'solid, flat, unpatterned'). The term ベタ is used in printing and design to describe a solid area of color without gradation or halftone.