Colorimetry, printing & prepress: Technology Home Forum Gallery Contacts Download Articles
Battling tirelessly
We'll Live, we, Sancho,
to see the Golden Age!

 
 
 
 
 
 
 
 
 


Spectral calculator (JavaScript)  |  Russian original
v.18.06.21 Input spectral data 340-830 nm, step from 1 nm; input XYZ or Lab or LCh
Output XYZ, Lab, LCh, Dens, DotGain, TVI, Trapping, relative contrast

Entering data from a file CGATS txt, CxF, xml, icc, icm



The calculator takes the files *.txt, *.cxf, *.ti3, *.icc, *.icm, *.lxf, *.dpxf, *.dmxf, *.xml and no larger than 2 megabytes. Files can contain both spectral and colorimetric (XYZ, Lab, LCh) data for the calculation of chromatic adaptation and TVI. Proper design CGATS native data can be viewed by clicking the button with the examples below, or by reference. Processing of ICC files can take from 6 to 60 seconds. The presence of foreign characters (spaces, commas, points, etc.) in the filenames that do not refer to letters and numbers in the Latin layout can lead to an error reading data from such a file.

Input Spectral or XYZ, xyY, Lab, LCh CGATS Data & CxF data:

Additional features and advanced settings
Force change the dimension of the spectrum:
Force change the type of spectrum (reflection/emission):
it is important
for emission
The number of columns in the visualization table:
Reference Range of colors in the chart:  
TVI and tolerances ±4 of the chart:  
The range of the vertical Y-axis values on the charts DotGain and TVI:
The values of the vertical Y-axis on the graph of local contrasts:
Conversion between the spectral filters:
     
Colorimetric color coordinate transformation with respect to the new white point (paper), or ISO 12647-2: 2013, tristimulus correction method: 
  (how it works)
LCh min: L C h
LCh max: L C h
Filter by:   
and when sorted by hue separate neutral area Chroma values from 0 to:
Sort data by two parameters:
with reference White D50 and CAT02 adaptation
for neutral gray
- Illuminating Engineering Society Method for Evaluating Light Source Color Rendition, Color Rendering Index and Color Quality Scale strictly on NIST 7.4 from CIE




**graphical representation of the spectrum of the sample
also invoked by clicking on the color patches below
Chromatic Adaptation Options
Capture Conditions White Point XYZ:
Viewing Conditions White Point XYZ:
  Default field XYZ Viewing Conditions are filled with values ​​for the illuminant D50. After copying only Reset button will return the value of WP Viewing Conditions XYZ D50 back.
CIECAM02 additional settings: (includes Fairchild presets, that's the CIE presets)
Capture Conditions Viewing Conditions
Scene average relative luminance:  
Scene adapting luminance:  
 
Scene surround:  
Viewing surround:  
Colorimetric thesaurus: ISO, CIE and ASTM tables
 

Output Color CGATS or Density Data:
 
 
© CIELab.XYZ
Scripting and support – Michael Sartakov
Scientific consultants – Alex Gribunin, Alexander Pylsky
Optimized high-speed CIECAM02 algorithm – Dmitriy Belchuk
Total hits - 58412
Total for the day - 2
Unique today - 2, yesterday - 18, the day before yesterday - 24