Projections of example tolerance ellipsoids
BCRA Tiles
image courtesy Avian Technologies
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This is a database of instrument evaluation files. These data accompany a pair of upcoming articles in
Color Research and Application.
These files are available for download. Most are in Microsoft Excel format.
General Information
In all files, instruments are identified only by letter. The classes of instruments are:
- Handheld hemispherical instruments: A,B,C,D
- Benchtop hemispherical instruments: E,F,G,H
- Bidirectionsl instruments: I,J,K,L
Additionally, there are two pairs of identical models: A and B, and K and L.
All colorimetric data are calculated using D65 and the 10° standard observer
Short-Term Repeatability Data
- 50 repeated measurements without replacement
- Pressed PTFE (spectral and colorimetric data)
- Glossy White Tile (spectral and colorimetric data)
- Individual instrument files (colorimetric data only, PTFE and glossy tile)
A,
B,
C,
D,
E,
F,
G,
H,
I,
J,
K,
L
Medium-Term Repeatability Data
- 10 measurements per hour for eight hours
- Pressed PTFE (colorimetric data)
Long-Term Repeatability Data
- 2 measurements per day for five weeks
- samples include: glossy and diffuse whites, cyan BCRA tile, cyan printed ink
- Pressed PTFE (spectral data) Note: worksheets are labeled by instrument number. An X indicates incomplete data.
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