B.I.G. Colour Check Chart14x19cm with ICC Profiling Program CoCa (BST11)

BST11 is a matt chart, with colorimetric reference data, colour comparator and digital charts on CD. The chart is used to judge colour rendition of any image processing, namely photography, video, softproof, projecting and print. By comparison of original chart with its reproduction, it is easy to evaluate colour authenticity. The chart is precise control tool with delicate surface. Please, protect it from moisture, dust, unnecessary lighting, high temperature and mechanical damage. Replace your chart regulary. The chart is produced in two sizes: 140x190 mm and 203x292 mm. 

COLOUR CHART & CD  IS DESIGNED FOR 

• testing colour rendition in photography: photo materials and their processing, lenses, light sources,
• determining filtration and exposure in colour photo-reproduction processes (enlarging, copying),
• verifying colour rendition in video and TV (comparing various cameras and recording media),
• verifying colour rendition in print (comparing various papers, inks, printers),
• colour balancing and tone evaluation in digital image processing (digital photo, scanning, computer adjustment),
• characterisation and colour control in digital photography: monitor setup, camera profiling and colour rendition check, printer adjustment,

THE CHART CONTAINS 

• Twenty four colour and grey patches, inkjet printed with matt surface.
• The colours are very near to Macbeth/Gretag/XRite colour checker chart. They represents principal hues for visual judgement of image (Dark Skin, Light Skin, Foliage, Sky), basic aditive and subtractive primaries (Red, Green, Blue, Cyan, Magenta, Yellow), samples of colours covering all colour space (Orange, Purplish Blue, Moderate Red, Purple, Yellow Green, Orange Yellow) with emphasis on heavily reproducible colours (Blue Flower, Bluish Green).
• Six-step grey scale covers basic gradation range of scene. White patch (88% reflectancy) represents superb white paper, black patch is darker than plain offset printed matt black. Entire contrast is 30:1.
• CD contains:

1) instructions for use ( Instruction Paper.pdf ),    
2) correct images of the chart in spaces sRGB and Adobe RGB (1998) - without ambedded profiles  ( DigitalChart sRGB.tiff , DigitalChart aRGB.tiff )            
3) reference data for camera profiling ( GretagCIE.txt , MonacoDC.txt, CoCaArgyll.txt ),        
4) colour comparator of 6 basic colour spaces ( ComparatorEN.xls ),  
5) ICC profiling software CoCa_setup_1.9.7.3 (open source programm available on  http://www.dohm.com.au) 

Target colourimetric coordinates of individual patches of the colour chart are identical with original X-Rite data. For common daylights (D65 and D50), are given in following data chart  ( L*a*b* = CIE 1976 coordinates ).  

Precise actual measured reference data (Yxy and Lab for D50 and D65) are given in Comparator.xls file on CD.

Use the chart as a colour rendition tester for any image reproduction process. 

The chart helps you to diagnose and evaluate many factors that affect color rendition. Change only one parameter of your reproduction process and compare chart copy (photocopy, TV visualisation, printout) with the original. Maintain all other parameters constant.

You can compare original chart with its hard copy, either visually or numerically.

Numerical values of individual paths might be: optical densities, CIE Lab colorimetric coordinates or RGB levels.  You can easily evaluate an influence of:

• spectral distribution of light sources, light reflection from coloured objects near the chart,
• light scattering and other parameters of camera lens and camera body,
• image-processing (duplicating, copying, printing, software adjustment, …),
• recording medium quality (film, magnetic tape, photo paper, ink-jet paper, ink-jet inks). 

HOW TO OPERATE THE CHART WITHOUT CD