The XachVision filter renders layers that produce an image that appears to be the image one might see on a surveillance camera monitor.
Here the user may select the color that is used to render the screen scan lines. Clicking the color box will produce a color selection dialog so that the color can be set interactively. FG will set the color to the current foreground color. BG will select the current background color.
This slider will set the amount of extra noise that is added to the render.