Each half of the cow is actually maximally metameric with itself.

It is designed such that both halves of each 'cow' appear to match when illuminated with CIE D65, and viewed with the CIE 1931 Standard Observer. It is rendered at 5nm increments, between 380 to 760.and is thus about 3gigs in size. METACOW is basically a very large (4200 x 6000 pixel) full-spectral image. This target, known as METACOW, is freely available to all performing research in color imaging. All these features can be important for visual assessment, computational analysis, and colorimetric evaluation. The target has several advantages over previous types of targets that include spatial resolution, dynamic range, spectral resolution, metameric properties, lack of noise, and continuous tonal variations. This website details the creation and application of a new digital color test target useful for research and development of color imaging systems. Standard, easily accessible, test targets have long served the field of color imaging as a foundation for comparison of the performance of various imaging systems and algorithms and the open and meaningful exchange of research results. METACOW: A Public-Domain, HighResolution, Fully-Digital, Noise-Free, Metameric, Extended-Dynamic-Range, Spectral Test Target for Imaging System Analysis and Simulation Pressed PTFE (spectral data) Note: worksheets are labeled by instrument number.samples include: glossy and diffuse whites, cyan BCRA tile, cyan printed ink.10 measurements per hour for eight hours.Individual instrument files (PTFE and glossy tile):.Glossy White Tile (spectral and colorimetric data).Pressed PTFE (spectral and colorimetric data).50 repeated measurements without replacement.All colorimetric data are calculated using D65 and the 10° standard observer.Additionally, there are two pairs of identical models: A and B, and K and L.Benchtop hemispherical instruments: E,F,G,H.Handheld hemispherical instruments: A,B,C,D.In all files, instruments are identified only by letter. These data accompany a pair of 2007 articles in Color Research and Application. This is a database of instrument evaluation files. If you find out otherwise, please let us know. All come 'as is.' We have found them useful, and done our best to ensure their accuracy.

Free munsell conversion software