The two spectral modes are panchromatic and multispectral. "GeoEye-1" provides panchromatic and multispectral imagery at nadir in swaths. The GeoEye-1 satellite collects images at 0.41-meter panchromatic (black-and-white) and 1.65-meter multispectral resolution. Normally microfilming uses high resolution panchromatic monochrome stock. The satellites had a nadir image resolution of , using panchromatic imagery. However, linear interpolation can obtain very good results when combined with a spatio-spectral (panchromatic) CFA. Recording all three spectral regions required making film stock panchromatic to some degree. Monochrome film is usually panchromatic; orthochromatic has fallen out of use. Almost all modern photographic film is panchromatic. SPOT 5 also features an HRS imaging instrument operating in panchromatic mode. It included a panchromatic only camera with a maximum resolution. Three panchromatic films are available from launch based on Agfa-Gevaert Aviphot products. Most modern black-and-white films, called panchromatic films, record the entire visible spectrum. It has a Ground Sampling Distance of 0.70 m panchromatic. It originated as Hypersensitive Panchromatic plates in 1931.