This method has the advantage of displaying the reference spectrum in the spectrum plot. If you select 'user entered' you can paste your own spectrum into the table in the 'Matching' column. If you select either blackbody or daylight you can enter these values in the UI. You can select between blackbody, daylight or 'user entered'. Then under the 'Matching' menu select which type of matching spectrum you want to use. If you select 'user' as the reference spectrum type, enable 'Matching mode' under the 'Matching' menu.If you use either a blackbody or daylight reference you can change these desired CCT in the UI or use the mouse wheel to change them.There are two ways to do this calculation. This metric is displayed on the 5th output tab.

Use the options under the 'Outputs' menu item to select between these three source types.

The 'Academy Spectral Similarity Index 2019 (SSI)' can be calculated using either a black body, daylight or user defined reference light source.

Use the 'Outputs->Set the order of the photometry data written to the Excel (tab delimited) file (photometry.xls)' menu item.

You can control which values are written to the photometry.xls file as well as the order they are written.

All of the output values from the 5 main output tabs are now written to the photometry.xls file, previously only selected values were written.

Added support for importing 'Argyll CMS' formatted spectra.

You can change the line width in the spectrum plots under the 'Image Options' menu item.

Cie color calculator