Photographic color densitometer check plate

A photographic color densitometer check plate comprising a support having thereon a plurality of light absorbing filters, each of which has a light transmission limit wavelength at a different spectral wavelength and which comletely and sharply absorbs light of a wavelength shorter than the wavelength of the light transmission limit wavelength said light transmission limit wavelength being defined as the mid-point of the wavelength corresponding to 5% and 72% of the curves of the transmission factor of the filters, said filters having light transmission limit wavelengths which are equally spaced over the wavelength region of the densitometer check plate.