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Color Inspector

Color sample analysis

Color Specification

This part reports all key information related to color specifications included in the color library. Detailed information which describes how the color in the library has been created (instrumentation and settings).

 
Single M condition (M1) color defined in the library

Color sample with multiple measurement conditions defined 

 

Color Recipe (only if specified within the file)

The library may contain Color Recipe information based on defined colorants. A "percent weight" may be included as on the following example:

 

Tolerances (only if specified)

Each individual color sample may have specific tolerance requirements. Formula, illuminant, observer and some key parameters for the calculation may be defined for each measurement condition.

This feature enables specifying unique tolerance values for each sample in the library. Whenever the tolerance is unspecified, a Library default tolerance value will be applied.

 

Spectral distribution curves

Up to four curves (M0,M1,M2,M3) can be plotted on the graph. Four round buttons in the right top corner can turned on/off to view the plots for various measurement conditions.

 

CIE color values

Colorimetric conversion to common color notation system is performed: Lab, LCHab,Luv, ,LCHuv, XYZ,  zyY
Note that Color Library may have illuminant and observer specified in color specification - values will be calculated for selected conditions.

 

Color Conversion

Colorimetric values are converted to user defined RGB and CMYK (CMYK +N) spaces based on imported ICC profiles. Additionally, an RAL Design notation is delivered.

RGB conversion

All existing measurement values will be converted into the defined RGB space based on the defined ICC Profile. The system will apply closest possible value, and make a reverse computation to check how accurate sample can be represented on selected ICC profile. A default ∆E formula is used to evaluate the difference between requested LAB value and LAB value after reverse computation is completed (roundtrip). The user can learn what is the precision of the applied conversion. RGB Values are also presented in hexadecimal notation.
If exclamation mark is displayed, it means that calculated value is out of gamut (color is out of destination space)


CMYK or N-color Conversion

Using the similar principle for RGB conversion described above, LAB values are converted (using absolute colorimetric rendering intent) by internal color management engine into separate channels (e.g. C, M, Y, K) 

The CMYK space may be insufficient (smaller gamut) to properly reproduce the given color sample. Roundtrip calculation will compare input LAB value with the LAB back converted from CMYK (or multichannel) profile and return a ∆E error of such conversion. The user will know exactly if color conversion is lossless or color shift will be noticeable.

It is important to remember that ICC profile is created from measurement data captured for specific measurement conditions. If the profile is defined with the original measurement condition, it will be marked with green background - showing that these are the CMYK values that should be used/referenced for the device CMYK (CMYK+n). 

A sample conversion for a spot to 6 color ICC profile, in this case, channels are: Cyan, Magenta Yellow, Black, Orange and Violet.

Setting ICC Profiles for RGB and CMYK spaces

In Color Inspector, the Preferences button is used by the user to define default RGB and CMYK (N-color) ICC Profiles to be used for this conversion. The RGB selection is limited to common RGB spaces:

  • Adobe RGB
  • Apple RGB
  • CIE RGB
  • ECI RGB
  • NTSC RGB
  • PAL/SECAM RGB
  • sRGB
  • ProPhoto RGB
  • Wide Gamut RGB

The user has the ability to select the desired Chromatic Adaptation formula (XYZ Scaling, Bradford or von Kries)

Default CMYK or N-color ICC profile can be selected from the list if ICC profile is already installed. In order to upload a custom one —> go to ICC Profile Inspector, and import desired profile. Once imported, it will be selectable.

If a conversion of all colors from a library into custom ICC profile is desired (color process -build) use dedicated tool —> Virtual Spot Print. 

 

 

Fluorescent effect (if detected only)

If the system detects the fluorescent effect (fluorescent within the color) an additional section will show the difference between M1 and M2 measurements - it describes emission of the light by specific colorants in the sample that absorbed other electromagnetic radiation (e.g. UV).  

fluo

If substrate contains OBAs or ink has fluorescent pigment this plot will create the spectral difference between M0 and M1 conditions. 

 

Color Inconstancy Index (CII)

Displays the numeric and visual simulation difference due to viewing this color in different lighting conditions. Color Inconstancy Index (sometimes called as Flair) indicates the degree to which the appearance of sample’s color changes when the light source (Illuminant) is changed. ChromaChecker Color Inspector presents the differences calculated for the most common illuminants: A, B, C, D50, D55, D60, D65, D75, E, F2, F7, F11 plus two custom illuminants that user may specify using ChromaChecker Lighting Inspector. 

In Global Preferences, the user may define Reference Illuminant, Reference Observer and ∆E formula applied to CII calculation. Reference Illuminant will be marked with green background. 


It is recommended to set Illuminant to D65 / Observer 10°

With the serious limitations related to color management of web browsers, this tool uses sRGB profile for rendering visual differences of how the color will change in various lighting conditions ( illuminant). This visualization is purely illustrative only, but the relative differences are useful.

 

CxF/X-4 Tints 

 

Dictionary (terms that may be used in color specification)

Apertures:

• Large Area View (LAV)
• Ultra-Small Area View (USAV)
• Medium Area View (MAV)
• Small Area View (SAV)
• Extra Ultra Small Area View (XUSAV)
• Medium Area View (MAV)

XRGA - X-Rite technology developed to define a specific M0 measurement condition. This was a color space to normalize how older X-Rite measurement devices measured differently than Gretag Macbeth instruments after the two companies merged. To learn more visit X-Rite website.