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Colour Difference Calculator
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This application supports colour difference calculation using the following colour differnce formulas:
CIE 94, CIE 2000, CIELab, CIELuv, CMC(l:c), DIN99, FMC1, FMC2, and HunterLab.
Colour difference calculation can be stored to and reloaded from your computer using File Options.
To activate the colour difference calculator, select  from the "View" menu or click  on the toolbar.
This activates the colour difference toolbar shown below:
1. Select the required CIE illuminant;
2. Select the required CIE standard observer;
3. For equations that allow for the specification of primary or secondary samples select as appropriate;
4. For equations that support textile colour differences (e.g. CMC) check the "textile" box if the samples are textile;
5. Select the notational format of the first colour sample from the pull-down list;
6. Select the notational format of the second colour sample from the pull-down list;
7. Select one or more colour difference formulas that the colour difference is required for from the pull-down check list;
8. Finally, specify one or more pairs of colour notations corresponding to the specified notations, pipe "|" separate the notations.
Press the "Go!" button to perform the colour difference calculation(s).
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Colour difference formulas can be selected and de-selected post-calculation and the results will be displayed in the colour difference grid. Additionally,
the precision of the colour differences can be changed by selecting the required precision (0-10) using the precision control: 
Use the horizontal and vertical scroll bars to change the proportions of the three views visible on the screen: the input screen (top), the results screen (bottom left), and the sample screen (bottom right).
Selecting a row in the results screen will display the associated colours in the sample screen as shown below:
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Note in the above screen-shot that additional colour difference formulas have been selected post initial calculation, the precision has been changed to 3 decimal places, and that the screens have been resized to display larger sample colours.
Colours can be selected for viewing in the "Colour Comparer" tool. Left click and hold down the left mouse button when over either of the two sample colours and then move the mouse pointer to one of the ten colour boxes on the status bar, releasing the left mouse button when over one of these boxes will copy that colour to that colour comparer box. In the screen-shot below, sample colours 1 and 2 have been copied to the first and second comparer boxes respectively.
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Note in the above screen-shot that additional colour difference formulas have been selected post initial calculation, the precision has been changed to 3 decimal places, and that the screens have been resized to display larger sample colours.
Colours can be selected for viewing in the "Colour Comparer" tool. Left click and hold down the left mouse button when over either of the two sample colours and then move the mouse pointer to one of the ten colour boxes on the status bar, releasing the left mouse button when over one of these boxes will copy that colour to that colour comparer box. In the screen-shot below, sample colours 1 and 2 have been copied to the first and second comparer boxes respectively.
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Copyright 2011, Virtual Colour Systems Ltd. All Rights Reserved
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