Rusty at ISIS Arts, Newcastle.
My patch is a dithered patch.
Dithering is a technique used in computer graphics to create the illusion of color depth in images with a limited color palette (color quantization). In a dithered image, colors not available in the palette are approximated by a diffusion of colored pixels from within the available palette. The human eye perceives the diffusion as a mixture of the colors within it (see color vision). Dithering is analogous to the halftone technique used in printing. Dithered images, particularly those with relatively few colors, can often be distinguished by a characteristic graininess, or speckled appearance.
An illustration of dithering. Red and blue are the only colors used, but as the pixels become smaller, the patch appears violet.
The fabric used uses two colours to achieve its final appearance.