The flat is used to make the printing plate. The person doing the image assembly is called a stripper . Stripping is the physical assembly of those images on a flat. Many stripping tables have edges that are true on all four sides for use with a T-square. A light table is used for stripping films onto a base sheet.
Light shines through the paper and film, making image assembly easier.
T-squares and triangles are used to align the film. A stripper uses a T-square to accurately position a goldenrod sheet on a work surface. Stripping knives are essential cutting tools. Magnifiers are used to examine film. When high-resolution images must be output for commercial printing, an imagesetter is used.