Ключевые слова: accessory, accuracy, adjust, adjustment, alphabet, balance, bar, black, calibration, camera, card, chart, check, checked, circle, control, device, digital, display, drawing, equipment, graduation, graphic, gray, green, guide, industry, layout, lens, line, mark, measure, optic, optical, performance, pictures, printer, quality, ray, ring, screen, sharpened, sight, spectrum, system, test, visible, visual,