标准色板

BCRA Color Standards

colourstds1

 

Lucideon Ltd ceramic standards, BCRA Series II tiles, are the popular standards for color calibration in the US and abroad. These standards can be used to calibrate color spectrophotometers in both hemispherical and directional/directional geometry. Avian Technologies CERAM sets consist of fourteen 2" tiles (the standard CERAM set plus a black and a white tile), mounted and sealed to prevent effects of humidity. 

For an in-depth analysis of Lucideon tiles, refer to "The BCRA-NPL Ceramic Color Standards Series II- Master Spectral Reflectance and Thermochromism Data", F. Malkin, J. Larkin, J. Verrill, and R. Wardman, JSDC 84, 84-94 (1997).
Similar to BCRA gray scale tiles, color tiles are also available in several options:
  • Matte or glossy finish
  • 2" square or 4" square
  • calibrated or uncalibrated (8:d, 8:T, 45:0 or any combination)

Custom sets are available. 

These standards are available calibrated with 8°:d hemispherical and/or 45:0c bidirectional geometries. Representative data, along with D65/2° CIELAB and CIEXYZ values can be downloaded for these measurement geometries: 45/0SCISCE.


ceramchrom1   ceramchrom2


Individual Color Standards

If you wish to assure an instrument stays within calibration but do not have the time it takes to run a full set of CERBCRAAM standards, it is suggested that a single tile with some spectral structure be used**. We have found that the best tile within the BCRA Series II set is the cyan tile. We offer this tile either calibrated or uncalibrated, made to the same specifications as the set described above. The tile is sealed in a Delrin holder and comes shipped in a hinged plastic box.

Part #

Description

BCRA-Cy-C Cyan BCRA Tile, Boxed Calibrated for
reflectance @ 8° hemispherical Geometry, 360-830 nm
BCRA-Cy-U Cyan BCRA Tile, Boxed, uncalibrated
BCRA-Cy-C450 Cyan tile calibrated for 45c:0 bidirectional radiance factor.
Note that ANY BCRA tiles can be ordered individually with any of the options described above.
** "An Abridged Technique to Diagnose Spectrophotometric Errors" R. Berns and L. Reniff, Color Research and Application,22 51-60 (1997)

 


Avian Ceramic Color Standards

Avian Technologies, in partnership with Mt. Baker Research, has developed a complete line of ceramic color transfer standards. These tiles are more fully described here, or download this PDF for a complete description, including spectral reflectance data. Mt. Baker Research has performed other analyses, including a detailed gamut analysis comparing our new tiles with the BCRA series and a few other color standards. All standards are mounted in Delrin holders, 2" (52 mm) square.

basicbox
Basic Colors
pastelbox
gray Scale and Pastel Colors
special box
Special Colors

The chart at right shows the color distribution (CIELAB b* vs a*) of the three Avian tiles sets in comparison to the chromatic BCRA tiles. Many of the Avian tiles extend and complete the available gamut of colors.

In general, t
his more complete coverage of color space improves results for many applications such device profiling, and instrument characterization and evaluation.



Click on any of the charts for a larger image.

tile

basicChromatic
Basic Set, chromatic tiles
basicGrayscale
Basic Set, neutral tiles

pastelChromatic 
Grayscale & Pastel Set, chromatic tiles
pastelGrayscale
Grayscale & Pastel Set, neutral tiles

special1 
Special Set tiles S-1 to S-8
special2
Special Set tiles S-9 to S-16

 

Part #

Description

AT-BC16-c8H (basic)
AT-GP16-c8H (grayscale)
AT-SC16-c8H (special)
Selected tile set calibrated for reflectance @ 8° hemispherical geometry, 360-830 nm
AT-BC16-c450 (basic)
AT-GP16-c450 (grayscale)
AT-SC16-c450 (special)
Selected tile set calibrated for reflectance @ 45:0c bidirectional geometry, 360-740 nm
AT-BC16-u (basic)
AT-GP16-u (grayscale)
AT-SC16-u (special)
Selected tile set 
Uncalibrated

Black Glass Standards

Highly polished black glass is useful as a standard for gloss, low reflectance in directional/directional geometry, and also establishing the efficiency of the 'sphere zero' in specular excluded geometry using an integrating sphere. The black glass standard is mounted in a Delrin holder with cover to protect the optical surface. The standards come calibrated for total hemispherical reflectance in 8°/hemispherical geometry from 350-850 nm

Part #

Description

BG-02C 2.0" (52 mm) square Black Glass Standard
Calibrated 360-830 nm 8°/hemispherical Geometry
BG-02U 2.0" (52 mm)Black Glass Standard 
Uncalibrated




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