The shape of the digital brushWhat is (Digital) Brush? A brush, found in digital painting applications such as Photoshop, Painter,... More created from a digital image. With Adobe applications, blackBlack is the fourth color in the process of four-color printing. The "K" in CMYK. Black adds tonal d... More areas of the brush tip will carry color for painting. White does not carry color. Gray paints with translucency. White and black are reversed with the Procreate iPad app.